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2026 United States Senate election in Maine

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The 2026 United States Senate election in Maine will be held on November 3, 2026, to elect a member of the United States Senate to represent the state of Maine. Republican incumbent Susan Collins is seeking a sixth term. She is being challenged by Democratic former state Senate president Troy Jackson. The election will be conducted with ranked-choice voting.

Quick facts Nominee, Party ...
2026 United States Senate election in Maine
← 2020
November 3, 2026 (2026-11-03)
2032 →
 
Nominee Susan Collins Troy Jackson (replacing Graham Platner)
Party Republican Democratic
Incumbent U.S. senator

Susan Collins
Republican


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In the June 9 primaries, Collins was the only candidate to qualify for the Republican nomination. Sullivan harbor master Graham Platner won the Democratic primary over Governor Janet Mills with the support of progressive leaders, but withdrew from the race on July 10 following sexual assault accusations and other controversies. Jackson was selected to replace Platner at a nominating convention on July 25.

As Collins is the only Republican senator representing a state that President Donald Trump did not win in any of his three presidential campaigns, the race is considered to be among the most competitive in 2026. Democrats have not won a Senate election in Maine since 1988 and not for this seat since 1972.[a]

Background

The election will be held on November 3, 2026,[1] coinciding with U.S. House elections, a gubernatorial election, and other local elections.[2] Both the primary and general elections will be conducted with ranked-choice voting.[3] Incumbent Republican U.S. senator Susan Collins is running for re-election to a sixth term.[4] Both primary elections took place on June 9, 2026.[5]

The northernmost state in New England, Maine is considered to be a moderately blue state. Maine has voted for every Democratic presidential nominee since 1992, and Democratic nominee Kamala Harris defeated Republican nominee Donald Trump by approximately seven percentage points in the 2024 United States presidential election in Maine. Democrats also control the governorship, the state legislature, and both seats in Maine's U.S. House congressional delegation.[6] Since 2018, Collins has been the only Republican representing any New England state in either chamber of Congress.[7]

Collins was first elected in 1996. She has been re-elected in four subsequent elections, significantly outperforming other Republicans in the state. In 2020, despite almost all polls and analysts predicting that she would lose her re-election bid, Collins defeated Democratic nominee Sara Gideon by a nine-point margin. Democratic presidential nominee Joe Biden carried Maine by about nine percentage points on the same ballot.[8]

This election is expected to be among the most competitive Senate races in 2026.[9] Collins is the only Republican senator who represents one of the 19 states that Donald Trump did not win in any of his three presidential campaigns.[10] With the decline of ticket splitting, Collins is widely viewed as the most vulnerable incumbent Republican senator in 2026.[11][12] Collins is also the only Republican senator facing re-election in a state that Kamala Harris won in the 2024 presidential election.[13] Since the 2024 United States Senate elections, Collins has been the last senator to represent a non-swing state (in other words, a reliably Democratic or Republican state) that typically supports the opposing party.[14]

Republican primary

Incumbent U.S. senator Susan Collins officially announced her re-election bid in February 2026.[15] Despite Collins receiving backlash from some Republicans for not supporting all of Trump's agenda during his second term as president, the Republican Party nonetheless supports her re-election campaign due to the fact that she is the only Republican who has been electorally successful in Maine in recent years.[16] However, she faced an unsuccessful primary challenge from former police officer Dan Smeriglio, who argued that she votes with Senate Democrats too often.[17][18] Ultimately, Collins was the only Republican to qualify for the primary ballot.[19]

Candidates

Nominee

Withdrawn

Endorsements

Susan Collins

Executive branch officials

U.S. senators
State legislators
Organizations
Declined to endorse

Executive branch officials

Fundraising

Italics indicate a withdrawn candidate

More information Campaign finance reports as of May 20, 2026, Candidate ...
Campaign finance reports as of May 20, 2026
Candidate Raised Spent Cash on hand
Carmen Calabrese (R)[b] $17,760 $21,260 $0.00
Susan Collins (R) $14,925,296 $6,547,574 $9,672,914
Source: Federal Election Commission[36]
Close

Polling

More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 Carmen
Calabrese		 Susan
Collins		 Dan
Smeriglio		 Other Undecided
March 1, 2026 Calabrese withdraws
University of New Hampshire[37] February 12–16, 2026 417 (LV) ± 4.9% 1% 67% 6% 1%[d] 25%
University of New Hampshire[38] October 16–21, 2025 417 (LV) ± 4.8% 1% 66% 1% 4%[e] 27%
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Results

More information Party, Candidate ...
Republican primary results
Party Candidate Votes %
Republican Susan Collins (incumbent) 126,398 100.0
Total votes 126,398 100.0
Close

Democratic primary

In April 2025, former congressional staffer Jordan Wood became the first Democrat to enter the race, running on a platform opposed to the Trump administration and Elon Musk.[39]

On August 19, Sullivan harbor master Graham Platner launched a progressive campaign backed by Bernie Sanders and organized labor, positioning himself against the "Democratic establishment" and drawing support from both liberal voters and some 2024 Trump voters.[40][41] In February 2026, Politico described Platner as "unlike any other recent popular candidate the state has seen". Noting Platner's large social media following, Politico added: "He is brash. He is progressive. He has drawn crowds of hundreds of people, national attention and millions in campaign dollars".[42]

After weeks of speculation and leaked campaign plans,[43] Gov. Janet Mills entered the race in October 2025.[44] The DSCC's close involvement in her campaign prompted backlash and allegations of favoritism in the primary.[45][46] Mills was widely viewed as a top Democratic recruit; she was encouraged to run by Senate Minority Leader Chuck Schumer, Senator Kirsten Gillibrand, and the Democratic Senatorial Campaign Committee (DSCC),[47] although Sanders publicly discouraged her candidacy.[48]

Following Mills's entry, several candidates, including Dan Kleban and Daira Smith-Rodriguez, withdrew and endorsed Mills.[49][50] Smith-Rodriguez cited concerns over past comments by Platner regarding sexual assault in the military.[51] Wood later withdrew to run for the U.S. House.[52]

In January 2026, Platner briefly paused his campaign due to his wife's medical treatment abroad[53] before resuming later that month. He returned to the campaign trail with protests against Immigrations and Customs Enforcement (ICE) enforcement actions.[54]

In February 2026, Mills committed to multiple debates ahead of the June 9 primary.[55]

Mills, Platner, and 2024 nominee David Costello qualified for the primary ballot.[56] In addition, University of Maine adjunct professor Andrea LaFlamme started a write-in bid for the Democratic nomination.[57]

The Platner/Mills contest was seen as a key contest between the Democratic Party's centrist establishment wing and the populist left-wing and progressive faction, with Mills representing the former and Platner representing the latter.[58]

In March 2026, Mills began running attack ads highlighting Platner's controversies. By April 2026, multiple polls had been released which showed Mills as much as 38 points behind Platner in the primary.[59] Shortly thereafter, the Mills campaign stopped running the attack ads and had made no additional ad purchases across any platform, leading to rumors that she would withdraw from the race.[60]

On April 30, Mills announced that she was suspending her campaign, but she did not endorse him. Her withdrawal led to Schumer and Gillibrand announcing they would now help Platner to defeat Susan Collins.[61]

Following the end of Mills' campaign, Platner was the only prominent and competitive Democrat left in the race, making him the most likely Democratic nominee.[62] Mills' name remained on the primary ballot,[63] and Costello also continued his campaign.[64] On June 9, Platner won the primary;[65] he received over 150,000 votes, more than any other Democratic candidate in a primary in Maine's history.[66]

Controversies over Graham Platner's behavior

Shortly after Mills entered the race, Platner came under fire for resurfaced controversial Reddit posts criticizing police officers, calling rural Americans "stupid" and referring to himself as a "communist", resulting in his campaign's political director, former state representative Genevieve McDonald, quitting the campaign and calling Platner "unelectable"; however, Democratic National Committee Chair Ken Martin stated that the comments were not disqualifying,[67] and Platner apologized in a five-minute video posted to social media. On October 21, Platner released a video of himself dancing and singing shirtless at his brother's wedding, revealing he had a chest tattoo that resembled the Totenkopf used by Nazi Germany's Schutzstaffel. Platner stated he got the tattoo while inebriated with other U.S. Marines while stationed in Croatia, mistaking the symbol for a generic skull and crossbones. He had the tattoo covered,[68] and professed his shame and disgust for getting a tattoo that resembled the fascist insignia.[69] Platner also called himself an anti-fascist "supersoldier" in an old Reddit comment.[70] After the controversies, Democrats such as Senator Chris Murphy defended Platner and said that he "sounds like a human being" who is honest about his mistakes.[71][72][73] Senator Ruben Gallego called his campaign "authentic" and said that he has "the right to grow out of his stupidity" and is not going to be a "crypto-Fetterman".[74][73]

On February 26, 2026, Platner quote-tweeted a clip from Donald Trump's 2026 State of the Union Address, criticizing Trump's speech. The clip had been posted by anti-Semitic white supremacist Stew Peters.[75] The tweet was deleted hours later, with a spokesperson for Platner's campaign telling The Hill that they were unaware of Peters's views.[76][77]

In May 2026, reports surfaced that Platner's wife had alerted his campaign team to explicit messages he was sending to women on the messaging app Kik, expressing concern that the behavior could hurt him politically. Additional reports during the same period drew attention to Platner's Nazi-linked tattoos, as well as past social media posts widely described as bigoted.[78]

In June 2026, The New York Times published an article including allegations of physical abuse and "unsettling" behavior from multiple women.[79] In response, Platner told media that his poor behavior was attributed to PTSD from his service in the Marine Corps. While he specifically denied the accusations made by one woman, he did not dispute the characterization of his behavior toward a second one.[80]

Candidates

Withdrew after nomination

Eliminated in primary

Withdrawn

Declined

Endorsements

Graham Platner

Executive branch officials

U.S. senators
U.S. representatives
Statewide officials
State legislators
Local officials
Party officials
Individuals
Labor unions
Organizations
Political parties
Dan Kleban (withdrawn)

State legislators

Individuals
Janet Mills (suspended campaign, remained on ballot)

U.S. senators

U.S. representatives
Statewide officials
State legislators
Individuals
  • Dan Kleban, brewery owner and former candidate for this seat[49]
  • Daira Smith-Rodriguez, former civilian contracting officer for the U.S. Air Force and former candidate for this seat[51]
Organizations
Jordan Wood (withdrawn)

U.S. representatives

Organizations
Declined to endorse

U.S. senators

U.S. representatives
Statewide officials
Individuals
  • Jordan Wood, candidate for ME-02 in 2026 and former candidate for this seat[136] (endorsed Platner after Mills suspended her campaign)[91]

Fundraising

Italics indicate a withdrawn candidate

More information Campaign finance reports as of May 20, 2026, Candidate ...
Campaign finance reports as of May 20, 2026
Candidate Raised Spent Cash on hand
David Costello (D) $149,655 $107,868 $41,787
David Evans (D)[b] $6,437 $6,437 $0
Tucker Favreau (D)[b] $13,599 $4,913 $5,170
Dan Kleban (D)[b] $458,787 $458,367 $420
Andrea LaFlamme (D) $7,739 $1,929 $5,810
Janet Mills (D)[i] $5,838,277 $5,121,375 $716,903
Graham Platner (D) $16,312,222 $14,131,391 $2,180,832
Daira Smith-Rodriguez (D)[b] $242,582 $242,582 $0
Jordan Wood (D)[b] $3,098,912 $2,178,443 $920,470
Source: Federal Election Commission[36]
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Polling

Aggregate polls

More information Source of poll aggregation, Dates administered ...
Source of poll
aggregation		 Dates
administered		 Dates
updated		 Janet
Mills		 Graham
Platner		 Other/Undecided
[j]		 Margin
270toWin[193] May 21 – June 5, 2026 June 8, 2026 13.0% 72.0% 15.0%[k] Platner +59.0%
Decision Desk HQ[194] through June 5, 2026 June 9, 2026 19.5% 65.8% 14.7% Platner +46.3%
Race to the WH[195] through May 25, 2026 May 27, 2026 11.9% 74.4% 13.7%[l] Platner +62.5%
Average 14.8% 70.7% 14.5% Platner +55.9%
Close
More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 David
Costello		 Janet
Mills		 Graham
Platner		 Jordan
Wood		 Other Undecided
Tavern Research (D)[196] June 5, 2026 704 (LV) ± 5.9% 5% 16% 68% — 2%[m] 9%
— 31% 69% — — —
— — 72% — 28%[n] —
University of New Hampshire[197] May 21–25, 2026 595 (LV) ± 4.0% 3% 10% 76% — 2%[o] 8%
April 30, 2026 Mills suspends her campaign, remains on ballot
Workbench Strategy (D)[198][A] April 6–9, 2026 600 (LV) — — 29% 64% — — 7%
Maine People's Resource Center (D)[199][B] March 20–31, 2026 514 (LV) — 2% 28% 61% — — 9%
Emerson College[200] March 21–23, 2026 530 (LV) ± 4.2% 1% 28% 55% — 4%[p] 13%
Impact Research (D)[201][C] March 19–23, 2026 500 (LV) — — 28% 66% — — 6%
Quantus Insights (R)[202] March 5, 2026 450 (LV) ± 3.4% — 38% 43% — — 19%
Pan Atlantic Research[203] February 13 – March 2, 2026 367 (LV) — 4% 39% 46% — — 11%
University of New Hampshire[37] February 12–16, 2026 462 (LV) ± 4.5% 1% 26% 64% — 3%[q] 6%
January 31, 2026 Favreau withdraws
Workbench Strategy (D)[204][A] December 11–16, 2025 500 (LV) — — 40% 55% — — 5%
Pan Atlantic Research[205] November 29 – December 7, 2025 318 (LV) — 1% 47% 37% — — 14%
Z to A Research (D)[206][D] November 14–18, 2025 845 (LV) ± 3.0% 0% 38% 58% — 2%[r] 2%
November 12, 2025 Wood withdraws
Maine People's Resource Center (D)[207][B] October 26–29, 2025 783 (V) ± 3.5% — 39% 41% 5% — 14%
— 47%[s] 53% — — —
SoCal Strategies[208] October 21–25, 2025 500 (LV) ± 4.4% 1% 41% 36% 2% — 20%
NRSC (R)[209] October 22–23, 2025 647 (LV) ± 3.5% — 25% 46% 3% — 26%
University of New Hampshire[38] October 16–21, 2025 510 (LV) ± 4.3% 1% 24% 58% 1% 1%[t] 14%
Close

Results

County results
  Platner
  •   60–70%
  •   70–80%
  •   80–90%
Congressional district results
  Platner
  •   70–80%
More information Party, Candidate ...
Democratic primary results[210]
Party Candidate Votes %
Democratic Graham Platner 156,084 72.1
Democratic Janet Mills (withdrawn) 41,644 19.2
Democratic David Costello 17,560 8.1
Democratic Andrea LaFlamme (write-in) 1,114 0.5
Total votes 216,402 100.0
Close

Platner withdrawal

On July 6, 2026, a woman Platner had previously dated accused him of raping her while he was drunk nearly five years prior.[211][212][213] Platner denied the accusation, accusing it of being a political attack to derail his campaign.[211][212] The next day, another woman who had previously dated Platner alleged that he would take condoms off during sex without her consent.[214][215]

Shortly after the rape allegation, US Senator Ruben Gallego and US Representative Ro Khanna rescinded their endorsements of Platner, and the Maine Democratic Party released a statement calling on Platner to suspend his campaign.[216][217] Platner later stated on the same day that the campaign would "tak[e] the time to reflect on the best path forward," fueling speculation that he would withdraw from the race.[218] Soon, numerous organizations and US senators, including those who had endorsed Platner, called on him to exit the race.[219][220] Senate Democratic Leader Chuck Schumer and Democratic Senatorial Campaign Committee chair Kirsten Gillibrand, who also rescinded their endorsements, stated that the DSCC would not invest in the race as long as Platner remained on the ballot.[219][221][222] On July 8, Platner announced that he would drop out of the race.[223] He officially filed to withdraw two days later.[83]

Democratic nominating convention

Process

No political party in Maine had replaced their nominee in any prior election. While the exact process to be used was not immediately certain, Maine Democratic Party officials and others like Maine Senate president Mattie Daughtry called for an open and inclusive process.[224] On July 8, the Maine Democratic Party voted to hold a state party convention to nominate a candidate to replace Platner as the Democratic nominee.[225] The convention was held on July 25 in Bangor.[226] In order to qualify for the convention, replacement candidates had until July 15 to declare their intent to run; they also had until July 21 to collect at least 500 signatures, with at least 50 signatures from eight different counties.[227] The convention consisted of 601 delegates overall, including the party's state committee.[225][228] 500 of the delegates were elected via county-level caucuses held on July 18–19.[229][230] All delegates at the convention were officially unpledged,[231] though candidates published slates of committed supporters before the county meetings.[229]

Campaign and convention

Leading up to and following Platner's withdrawal, former gubernatorial candidates Nirav Shah, Troy Jackson, and Shenna Bellows were viewed as likely frontrunners for the replacement nomination.[232][233][234] Jackson was the first to declare his candidacy for the Senate nomination,[235] while Shah was the first candidate to receive sufficient signatures to qualify.[236] Following the county meetings, at least 456 of the selected delegates were pledged supporters of Jackson,[u] placing him in the lead for the nomination.[237][240][241] Bellows and Shah, along with candidates Dan Kleban and Jordan Wood, all withdrew from the race on July 19.[242]

Jackson and healthcare executive Saundra Pelletier were the only candidates to qualify for the convention ballot and continue their campaigns after the county caucuses.[243] Jackson won the convention vote over Pelletier, 566–5.[244]

Candidates

Nominee

Eliminated at convention

Failed to qualify

Withdrawn

Declined

Endorsements

Troy Jackson
U.S. representatives
Statewide officials
State legislators
Individuals
Labor unions
Organizations
Shenna Bellows (withdrawn)
State legislators
Organizations
Declined to endorse
U.S. senators
Statewide officials

Polling

More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 Shenna
Bellows		 David
Costello		 Troy
Jackson		 Dan
Kleban		 Paige
Loud		 Nirav
Shah		 Jordan
Wood		 Other Undecided
University of New Hampshire[293] July 15–20, 2026 538 (LV) ± 4.3% 11% 0% 51% 1% 1% 26% 1% 3%[E] 5%
Blueprint Polling (D)[294] July 9–10, 2026 884 (LV) ± 3.1% 14% 0% 40% 1% 1% 23% 3% 8%[F] 10%
Close

Debates

A debate featuring eight of the declared candidates, hosted by News Center Maine, occurred on July 16, 2026.[295] A second debate, hosted by the Bangor Daily News and CNN, was scheduled for July 23, but was later cancelled.[296]

More information No., Date ...
Democratic nominating convention debates
No. Date Hosts Moderators Link Participants
Key:
 P  Participant  W  Withdrawn
Bellows Costello Dickerson Jackson Kleban Loud Shah Webb Wood
1 July 16, 2026[295] News Center Maine Rob Caldwell
Phil Hirschkorn		 P P P P P W P P P
Close

Results

More information Candidate, Delegates ...
Pledged delegates by candidate prior to convention[237][v]
Candidate Delegates
Troy Jackson 456
Uncommitted 34
Nirav Shah (withdrawn) 6
Shenna Bellows (withdrawn) 2
Jordan Wood (withdrawn) 2
Close
County caucus results
  Jackson
  •   40–50%
  •   60–70%
  •   70–80%
  •   80–90%
  •   90–100%
  Uncommitted
  •   50%
More information County, Troy Jackson ...
Pledged delegates by county prior to convention[237][v]
County Troy Jackson Uncommitted Nirav Shah
(withdrawn)		 Shenna Bellows
(withdrawn)		 Jordan Wood
(withdrawn)
Androscoggin 24 7 0 0 0
Aroostook 15 0 0 0 0
Cumberland 148 1 0 0 0
Franklin 6 2 0 0 1
Hancock 22 1 0 0 0
Kennebec 36 4 0 0 0
Knox 18 0 0 0 0
Lincoln 7 3 3 1 1
Oxford 13 3 1 0 0
Penobscot 44 0 0 0 0
Piscataquis 3 1 0 0 0
Sagadahoc 16 0 0 0 0
Somerset 11 1 0 0 0
Waldo 14 1 0 0 0
Washington 1 4 2 1 0
York 78 6 0 0 0
Close
More information Party, Candidate ...
Democratic convention results[244]
Party Candidate Votes %
Democratic Troy Jackson 566 99.1%
Democratic Saundra Pelletier 5 0.9%
Total votes 571 100.0%
Close

Independents

Candidates

Did not qualify

Withdrawn

Fundraising

Italics indicate a withdrawn candidate

More information Campaign finance reports as of September 30, 2025, Candidate ...
Campaign finance reports as of September 30, 2025
Candidate Raised Spent Cash on hand
Phillip Rench (I)[b] $55,313 $31,072 $24,241
Source: Federal Election Commission[36]
Close

General election

Predictions

More information Source, Ranking ...
Source Ranking As of
The Cook Political Report[301] Tossup July 2, 2026
Decision Desk HQ[302] Tossup July 14, 2026
The Economist[303][w] Lean D (flip) July 10, 2026
FiftyPlusOne[304] Lean D (flip) August 11, 2026
Fox News[305] Tossup July 21, 2026
Inside Elections[306] Tilt R June 25, 2026
Race to the WH[307] Tilt D (flip) July 19, 2026
RealClearPolitics[308] Tossup May 24, 2026
Sabato's Crystal Ball[309] Tossup July 1, 2026
Close

Post-primary endorsements

Susan Collins (R)
Executive branch officials
Troy Jackson (D)
Executive branch officials
Individuals
Labor unions
Graham Platner (D) (withdrawn)
U.S. senators
Individuals
Labor unions
Organizations
Declined to endorse
Executive branch officials
U.S. senators
Individuals

Fundraising

More information Campaign finance reports as of June 30, 2026, Candidate ...
Campaign finance reports as of June 30, 2026
Candidate Raised Spent Cash on hand
Susan Collins (R) $18,930,078 $9,187,155 $11,038,115
Troy Jackson (D) $0 $0 $0
Source: Federal Election Commission[325]
Close

Polling

Aggregate polls
More information Source of poll aggregation, Dates administered ...
Source of poll
aggregation		 Dates
administered		 Dates
updated		 Susan
Collins (R)		 Troy
Jackson (D)		 Other/Undecided Margin
Race to the WH[195] Through August 1, 2026 August 6, 2026 46.0% 47.9% 6.1% Jackson +1.9%
RealClearPolitics[326] July 7–20, 2026 July 22, 2026 46.0% 48.3% 5.7% Jackson +2.3%
Average 46.0% 48.1% 5.9% Jackson +2.1%
Close
More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 Susan
Collins (R)		 Troy
Jackson (D)		 Other Undecided
Hart Research (D)[327][G] July 27 – August 1, 2026 802 (LV) ± 3.5% 45% 49% — 6%
University of New Hampshire[293] July 15–20, 2026 1,178 (LV) ± 2.9% 46% 49% 2%[x] 3%
Z to A Research (D)[328][H] July 7–8, 2026 988 (LV) ± 3.1% 48% 47% — 5%
Public Policy Polling (D)[329][I] July 7, 2026 785 (LV) — 44% 49% — 7%
Wedgewood Polls (D)[330] July 4–6, 2026 405 (LV) ± 5.8% 43% 48% — 9%
Close
Hypothetical polling
Susan Collins vs. Shenna Bellows
More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 Susan
Collins (R)		 Shenna
Bellows (D)		 Undecided
Z to A Research (D)[328][H] July 7–8, 2026 988 (LV) ± 3.1% 47% 47% 6%
Public Policy Polling (D)[329][I] July 7, 2026 785 (LV) — 47% 47% 6%
Close
Susan Collins vs. Graham Platner
More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 Susan
Collins (R)		 Graham
Platner (D)		 Other Undecided
July 8, 2026 Platner suspends his campaign
Public Policy Polling (D)[329][I] July 7, 2026 785 (LV) — 47% 42% — 11%
July 6, 2026 Platner sexual assault allegation reported
Wedgewood Polls[330] July 4–6, 2026 405 (LV) ± 5.8% 50% 46% — 4%
Tavern Research (D)[331] July 3–6, 2026 1,074 (LV) ± 3.4% 48% 52% — —
Beacon Research (D)/Shaw & Co. Research (R)[332][J] June 23–27, 2026 1,003 (RV) ± 3.0% 50% 47% — 3%
The New York Times/Portland Press Herald/Siena University[333] June 19–26, 2026 608 (LV) ± 4.8% 47% 49% — 4%
Wick (R)/2WAY[334] June 11–14, 2026 1,008 (LV) ± 3.1% 45% 48% — 7%
Quantus Insights (R)[335] June 9–11, 2026 870 (LV) ± 3.4% 45% 46% 2%[y] 7%
The Public Sentiment Institute[195][336] June 8, 2026 497 (LV) ± 4.9% 44% 43% — 13%
Tavern Research (D)[337] June 5–8, 2026 1,642 (LV) ± 2.8% 49% 51% — —
Public Policy Polling (D)[338][A] June 2–3, 2026 670 (RV) ± 3.8% 45% 49% — 6%
Fabrizio, Lee & Associates (R)[339][K] June 1–3, 2026 800 (LV) ± 3.5% 46% 46% — 8%
UMass Lowell/YouGov[340] May 13–26, 2026 650 (LV) ± 4.9% 43% 48% 1%[z] 6%
University of New Hampshire[197] May 21–25, 2026 1,280 (LV) ± 2.7% 42% 51% 2%[x] 8%
Pan Atlantic Research[341] May 8–18, 2026 827 (LV) ± 3.7% 41% 48% — 11%
Echelon Insights (R)[342][L] April 3–9, 2026 378 (LV) ± 6.3% 45% 51% — 6%
Maine People's Resource Center (D)[199][B] March 20–31, 2026 1,167 (LV) ± 2.9% 39% 48% — 13%
Emerson College[200] March 21–23, 2026 1,075 (LV) ± 2.9% 41% 48% 6%[aa] 6%
OnMessage Public Strategies (R)[343][M] March 3–8, 2026 600 (LV) ± 4.0% 42% 44% — 14%
Quantus Insights (R)[202] March 5, 2026 800 (LV) ± 3.4% 42% 49% 4%[ab] 6%
Pan Atlantic Research[203] February 13 – March 2, 2026 810 (LV) ± 3.7% 40% 44% — 16%
University of New Hampshire[37] February 12–16, 2026 1,105 (LV) ± 2.9% 38% 49% 4%[ac] 9%
Fabrizio, Lee & Associates (R)[344][K] January 20–24, 2026 800 (LV) ± 3.5% 45% 44% — 11%
Workbench Strategy (D)[204][A] December 11–16, 2025 900 (LV) ±4.4% 50% 50% — —
Pan Atlantic Research[205] November 29 – December 7, 2025 820 (LV) ± 3.7% 42% 43% — 15%
Maine People's Resource Center[207][B] October 26–29, 2025 783 (LV) ± 3.5% 41% 45% — 14%
Zenith Research (D)[345][N] October 7–10, 2025 501 (LV) ± 4.4% 38% 38% 10%[ad] 15%
Close

Susan Collins vs. generic Democrat

More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 Susan
Collins (R)		 Generic
Democrat		 Undecided
Tavern Research (D)[337] June 5–8, 2026 1,642 (LV) ± 2.8% 45% 55% —
Cygnal (R)[346] November 10–11, 2025 600 (LV) ± 4.0% 41% 49% 11%
Close
Susan Collins vs. Dan Kleban
More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 Susan
Collins (R)		 Dan
Kleban (D)		 Undecided
Public Policy Polling (D)[347][O] September 8–9, 2025 642 (RV) — 35% 44% 21%
Close

Susan Collins vs. Janet Mills

More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 Susan
Collins (R)		 Janet
Mills (D)		 Other Undecided
Public Policy Polling (D)[329][I] July 7, 2026 785 (LV) — 48% 37% — 15%
Wedgewood Polls[330] July 4–6, 2026 405 (LV) ± 5.8% 47% 47% — 6%
Tavern Research (D)[337] June 5–8, 2026 1,642 (LV) ± 2.8% 48% 52% — —
April 30, 2026 Mills suspends her campaign
Echelon Insights (R)[342][L] April 3–9, 2026 378 (LV) ± 6.3% 46% 48% — 6%
Maine People's Resource Center (D)[199][B] March 20–31, 2026 1,167 (LV) ± 2.9% 45% 42% — 9%
Emerson College[200] March 21–23, 2026 1,075 (LV) ± 2.9% 43% 46% 8%[ae] 3%
OnMessage Public Strategies (R)[343][M] March 3–8, 2026 600 (LV) ± 4.0% 42% 42% — 16%
Quantus Insights (R)[202] March 5, 2026 800 (LV) ± 3.4% 45% 43% 7%[af] 6%
Pan Atlantic Research[203] February 13 – March 2, 2026 810 (LV) ± 3.7% 44% 44% — 12%
University of New Hampshire[37] February 12–16, 2026 1,105 (LV) ± 2.9% 40% 41% 9%[ag] 10%
Fabrizio, Lee & Associates (R)[344][K] January 20–24, 2026 800 (LV) ± 3.5% 45% 44% — 11%
Workbench Strategy (D)[204][A] December 11–16, 2025 900 (LV) ±4.4% 51% 49% — —
Pan Atlantic Research[205] November 29 – December 7, 2025 820 (LV) ± 3.7% 43% 43% — 14%
Maine People's Resource Center[207][B] October 26–29, 2025 783 (LV) ± 3.5% 46% 42% — 14%
Zenith Research (D)[345][N] October 7–10, 2025 501 (LV) ± 4.4% 37% 42% 10%[ad] 12%
Close
Susan Collins vs. Nirav Shah
More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 Susan
Collins (R)		 Nirav
Shah (D)		 Undecided
Z to A Research (D)[328][H] July 7–8, 2026 988 (LV) ± 3.1% 46% 47% 5%
Public Policy Polling (D)[329][I] July 7, 2026 785 (LV) — 45% 45% 10%
Close
Susan Collins vs. Jordan Wood
More information Poll source, Date(s) administered ...
Poll source Date(s)
administered		 Sample
size[c]		 Margin
of error		 Susan
Collins (R)		 Jordan
Wood (D)		 Undecided
Public Policy Polling (D)[329][I] July 7, 2026 785 (LV) — 47% 38% 15%
Close

Notes

  1. [a]
    Angus King, who was elected in 2012 and re-elected in 2018 and 2024, is an independent who caucuses with the Democrats, but is not a member of the party.
  2. [b]
    Withdrawn candidate
  3. [c]
    Key:
    A – all adults
    RV – registered voters
    LV – likely voters
    V – unclear
  4. [d]
    "Another candidate" with 1%
  5. [e]
    "Write in someone else" with 4%
  6. [f]
    Resigned as campaign political director and withdrew endorsement after controversy around old Reddit comments.
  7. [g]
  8. [h]
  9. [i]
    Campaign suspended
  10. [j]
    Calculated by taking the difference of 100% and all other candidates combined.
  11. [k]
    David Costello with 4%; Andrea LaFlamme with 2%
  12. [l]
    David Costello with 2.9%; Andrea LaFlamme with 1.6%
  13. [m]
    LaFlamme with 2%
  14. [n]
    "Another Democrat candidate" with 28%
  15. [o]
    "Another candidate" with 2%
  16. [p]
    LaFlamme and "Someone else" with 2%
  17. [q]
    LaFlamme with 2%; "Another candidate" with 1%; Evans and Favreau with 0%
  18. [r]
    Evans and LaFlamme with 1%; Favreau with 0%
  19. [s]
    With undecided and Wood votes re-allocated based on second-choice preference
  20. [t]
    "Write in someone else" with 1%; Evans, Favreau, and LaFlamme with 0%
  21. [u]
    There is inconsistency between reports of the exact number of delegates that pledged for Jackson. The Bangor Daily News, in their breakdown of county meeting results, reported 456 Jackson delegates.[237] Maine Morning Star reported 478 Jackson delegates.[238] Jackson's campaign gave a figure of 481 delegates.[239]
  22. [v]
    The convention consisted of 601 delegates, including 101 members of the Maine Democratic State Committee; this table features only the 500 delegates elected in county caucuses. Figures are given per reporting by the Bangor Daily News.
  23. [w]
    The Economist's prediction model uses unconventional terminology. For the purpose of equivalency, their "Very Likely" ratings are formatted as a "Likely" rating, while their "Likely" ratings are formatted as a "Lean" rating.
  24. [x]
    "Another candidate" with 2%
  25. [y]
    "Someone else" with 2%
  26. [z]
    "Would not vote" with 1%
  27. [aa]
    "Someone else" with 6%
  28. [ab]
    "Someone else / Third party" with 3%; "Would not vote" with 1%
  29. [ac]
    "Another candidate" with 4%
  30. [ad]
    "Another candidate" with 9%; "Would not vote" with 1%
  31. [ae]
    "Someone else" with 8%
  32. [af]
    "Someone else / Third party" with 6%; "Would not vote" with 1%
  33. [ag]
    "Another candidate" with 9%

Partisan client

  1. [A]
    Poll sponsored by Platner's campaign.[204]
  2. [B]
    Pollster affiliated with the Maine People's Alliance, which has endorsed Platner's campaign.[150]
  3. [C]
    Poll commissioned by gubernatorial candidate Troy Jackson, who has endorsed Platner's campaign.[119]
  4. [D]
    Poll sponsored by the Progressive Change Campaign Committee, which has endorsed Platner's campaign.
  5. [E]
    "Another candidate" with 3%; Ashley Webb with 0%
  6. [F]
    "Someone else" with 7%; Valli Geiger with 1%
  7. [G]
    Poll sponsored by Senate Majority PAC, which is focused on electing Democrats to the U.S. Senate
  8. [H]
    Poll commissioned by a pro-Shah group
  9. [I]
    Poll sponsored by Platner's campaign.
  10. [J]
    Poll conducted for Fox News
  11. [K]
    Poll sponsored by Pine Tree Results, a Collins-aligned Super PAC.
  12. [L]
    Poll commissioned by NetChoice
  13. [M]
    Poll sponsored by the Insurance Watchdog Coalition.
  14. [N]
    Poll sponsored by More Perfect Union, a progressive non-profit news media organization.
  15. [O]
    Poll sponsored by Kleban's campaign.

References

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