1978 United States Senate election in Colorado
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The 1978 United States Senate election in Colorado took place on November 7, 1978. Incumbent Democratic Senator Floyd Haskell ran for re-election to a second term, but was soundly defeated by Republican U.S. Representative William L. Armstrong.
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November 7, 1978
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 County results Armstrong: 50–60% 60–70% 70–80% Haskell: 50–60% 60–70% | |||||||||||||||||
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Republican primary
Candidates
- William L. Armstrong, U.S. Representative from Littleton
- Jack Swigert, astronaut
Withdrew
- John Cogswell, lawyer and Bob Dole aide (endorsed Armstrong)
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | William L. Armstrong | 109,021 | 73.45% | |
| Republican | Jack Swigert | 39,415 | 26.55% | |
| Total votes | 148,436 | 100.00% | ||
General election
Results
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Republican | William L. Armstrong | 480,801 | 58.69% |  10.52 | |
| Democratic | Floyd Haskell (incumbent) | 330,148 | 40.30% |  9.11 | |
| Independent | Veeder V. Dorn | 5,789 | 0.71% | N/A | |
| Prohibition | John Shue | 2,518 | 0.31% | N/A | |
| Total votes | 819,256 | 100.00% | |||