# 1978 United States Senate election in Colorado

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vte :
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.

## Republican primary
### Candidates

* William L. Armstrong, U.S. Representative from Littleton
* Jack Swigert, astronaut

### Withdrew

* John Cogswell, Lawyer and Bob Dole aid (Endorsed Armstrong)

### Results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | William L. Armstrong | 109,021 | 73.45% |
| | Republican | Jack Swigert | 39,415 | 26.55% |
| Total votes | Total votes | Total votes | 148,436 | 100.00% |

## General election
### Results

General election results :
| Party | 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 | Total votes | Total votes | 819,256 | 100.00% |