# 1966 United States Senate election in Minnesota

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vte :
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.

## Democratic–Farmer–Labor primary
### Candidates
#### Declared

* Ralph E. Franklin
* Walter Mondale, Incumbent U.S. Senator since 1964

### Results

Democratic primary election results :
| Party | Party | Candidate | Votes | % |
| | Democratic (DFL) | Walter Mondale (Incumbent) | 410,841 | 90.97% |
| | Democratic (DFL) | Ralph E. Franklin | 40,785 | 9.03% |
| Total votes | Total votes | Total votes | 451,626 | 100.00% |

## Republican primary
### Candidates
#### Declared

* Robert A. Forsythe, businessman
* Henry A. Johnsen

### Results

Republican primary election results :
| Party | Party | Candidate | Votes | % |
| | Republican | Robert A. Forsythe | 211,282 | 81.19% |
| | Republican | Henry A. Johnsen | 48,941 | 18.81% |
| Total votes | Total votes | Total votes | 260,223 | 100.00% |

## General election
### Results

General election results :
| Party | 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 | Total votes | Total votes | 1,271,426 | 100.00% |
| Majority | Majority | Majority | 110,972 | 8.73% |
| | Democratic (DFL) hold | Democratic (DFL) hold | Democratic (DFL) hold | Democratic (DFL) hold |