2020 United States Senate election in South Dakota
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The 2020 United States Senate election in South Dakota was held on November 3, 2020, to elect a member of the United States Senate to represent the State of South Dakota, concurrently with the 2020 U.S. presidential election, as well as other elections to the United States Senate, elections to the United States House of Representatives and various state and local elections. Incumbent Republican Senator Mike Rounds was reelected to a second term in office, overperforming Donald Trump in the concurrent presidential election by 4.93 points.
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November 3, 2020
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  Rounds: 50–60% 60–70% 70–80% 80–90% >90% Ahlers: 50–60% 60–70% 70–80% 80–90% >90% | |||||||||||||||||
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Republican primary
Candidates
Nominee
- Mike Rounds, incumbent U.S. senator[1]
Eliminated in primary
- Scyller Borglum, state representative[2]
Results
Rounds
- 50–60%
- 60–70%
- 70–80%
- 80–90%
Borglum
- 50–60%
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Mike Rounds (incumbent) | 70,365 | 75.23% | |
| Republican | Scyller Borglum | 23,164 | 24.77% | |
| Total votes | 93,529 | 100.00% | ||
Democratic primary
Candidates
Nominee
- Daniel Ahlers, former state representative and former state senator[4]
Did not qualify
- Clara Hart, board member of the Sioux Falls Arts Council[5]
Declined
- Erin Healy, state representative[6]
- Brendan Johnson, former United States Attorney for the District of South Dakota[7]
- Billie Sutton, former minority leader of the South Dakota Senate and nominee for Governor of South Dakota in 2018[8]
- Susan Wismer, state senator and Democratic nominee for Governor of South Dakota in 2014[6]
Independents
Candidates
Withdrew
- Clayton Walker, independent candidate in the 2014 United States Senate election in South Dakota and Democratic candidate in the 2010 South Dakota House of Representatives elections[9]
General election
Predictions
| Source | Ranking | As of |
|---|---|---|
| The Cook Political Report[10] | Safe R | October 29, 2020 |
| Inside Elections[11] | Safe R | October 28, 2020 |
| Sabato's Crystal Ball[12] | Safe R | November 2, 2020 |
| Daily Kos[13] | Safe R | October 30, 2020 |
| Politico[14] | Safe R | November 2, 2020 |
| RCP[15] | Safe R | October 23, 2020 |
| DDHQ[16] | Safe R | November 3, 2020 |
| 538[17] | Safe R | November 2, 2020 |
| Economist[18] | Safe R | November 2, 2020 |
Polling
Results
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Republican | Mike Rounds (incumbent) | 276,232 | 65.74% | +15.37% | |
| Democratic | Daniel Ahlers | 143,987 | 34.26% | +4.75% | |
| Total votes | 420,219 | 100.00% | N/A | ||
| Republican hold | |||||
By county
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Counties that flipped from Democratic to Republican
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Notes
- Key:
A – all adults
RV – registered voters
LV – likely voters
V – unclear