1966 United States Senate election in Minnesota
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The 1966 United States Senate election in Minnesota took place on November 8, 1966. Incumbent Democratic U.S. Senator Walter Mondale, who had originally been appointed in 1964 to replace Hubert Humphrey after Humphrey was elected Vice President of the United States, defeated Republican challenger Robert A. Forsythe, to win a full term.
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November 8, 1966
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 County results Mondale: 40–50% 50–60% 60–70% 70–80% Forsythe: 40–50% 50–60% 60–70% | |||||||||||||||||
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Democratic–Farmer–Labor primary
Candidates
Declared
- Ralph E. Franklin
- Walter Mondale, Incumbent U.S. Senator since 1964
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic (DFL) | Walter Mondale (Incumbent) | 410,841 | 90.97% | |
| Democratic (DFL) | Ralph E. Franklin | 40,785 | 9.03% | |
| Total votes | 451,626 | 100.00% | ||
Republican primary
Candidates
Declared
- Robert A. Forsythe, businessman[2]
- Henry A. Johnsen
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Robert A. Forsythe | 211,282 | 81.19% | |
| Republican | Henry A. Johnsen | 48,941 | 18.81% | |
| Total votes | 260,223 | 100.00% | ||
General election
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic (DFL) | Walter Mondale (Incumbent) | 685,840 | 53.94% | |
| Republican | Robert A. Forsythe | 574,868 | 45.21% | |
| Socialist Workers | Joseph Johnson | 5,487 | 0.43% | |
| Industrial Government | William Braatz | 5,231 | 0.41% | |
| Total votes | 1,271,426 | 100.00% | ||
| Majority | 110,972 | 8.73% | ||
| Democratic (DFL) hold | ||||