1966 United States Senate elections in Michigan
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The 1966 United States Senate elections in Michigan were 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.
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November 8, 1966
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 County results Griffin: 50–60% 60–70% 70–80% Williams: 40–50% 50–60% | |||||||||||||||||
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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
Williams
- Williams—80–90%
- Williams—70–80%
- Williams—60–70%
- Williams—50–60%
Cavanagh
- Cavanagh—50–60%
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | G. Mennen Williams | 437,438 | 60.10% | |
| Democratic | Jerome P. Cavanagh | 290,465 | 39.90% | |
| Write-in | 2 | 0.00% | ||
| Total votes | 727,905 | 100.00% | ||
General election
Results
Regular
| 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 | 2,439,180 | 100.00% | ||
Special
| 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 | 2,358,804 | 100.00% | ||