# 1966 United States Senate election in Michigan

Elections in Michigan :
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vte :
The 1966 United States Senate election in Michigan was held on November 7, 1966. Incumbent Republican U.S. Senator Robert P. Griffin, who had been appointed to the seat in May to fill the vacancy left by the death of Patrick V. McNamara, was re-elected to a full term in office. Griffin defeated Democratic former Governor G. Mennen Williams in the regularly scheduled election, as well as the concurrent special election to complete McNamara's unfinished term.

## Democratic primary
### Candidates

* Jerome P. Cavanagh, Mayor of Detroit
* G. Mennen Williams, Assistant U.S. Secretary of State for Africa Affairs and former Governor of Michigan (1949–1961)

### Results

1966 U.S. Senate election in Michigan :
| Party | Party | Candidate | Votes | % |
| | Democratic | G. Mennen Williams | 437,438 | 60.10% |
| | Democratic | Jerome P. Cavanagh | 290,465 | 39.90% |
| | Write-in | Write-in | 2 | 0.00% |
| Total votes | Total votes | Total votes | 727,905 | 100.00% |

## General election
### Results

1966 U.S. Senate election in Michigan :
| Party | Party | Candidate | Votes | % |
| | Republican | Robert P. Griffin (incumbent) | 1,363,530 | 55.90% |
| | Democratic | G. Mennen Williams | 1,069,484 | 43.85% |
| | Socialist Labor | James Sim | 6,166 | 0.25% |
| Total votes | Total votes | Total votes | 2,439,180 | 100.00% |

### Special election

1966 U.S. Senate special election in Michigan :
| Party | Party | Candidate | Votes | % |
| | Republican | Robert P. Griffin (incumbent) | 1,321,222 | 56.01% |
| | Democratic | G. Mennen Williams | 1,031,138 | 43.71% |
| | Socialist Labor | James Sim | 6,444 | 0.27% |
| Total votes | Total votes | Total votes | 2,358,804 | 100.00% |