# 1974 United States Senate election in Colorado

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vte :
The 1974 United States Senate election in Colorado took place on November 5, 1974. Incumbent Republican U.S. Senator Peter Dominick ran for re-election to a third term in office, but was defeated by Democrat Gary Hart. As of 2024, this is the last time that an incumbent Senator from Colorado lost re-election for this seat, and the last time that El Paso County voted for the Democratic candidate in a Senate election.

## Democratic primary
### Candidates

* Gary Hart, campaign manager for George McGovern in 1972
* Marty Miller, Arapahoe County District Attorney
* Herrick Roth, former State Senator from Denver

### Results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Gary Hart | 81,161 | 39.92% |
| | Democratic | Herrick Roth | 66,819 | 32.86% |
| | Democratic | Marty Miller | 55,339 | 27.22% |
| Total votes | Total votes | Total votes | 203,319 | 100.00% |

## General election
### Results

1974 United States Senate election in Colorado :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | Gary Hart | 471,691 | 57.23% | 15.78 |
| | Republican | Peter Dominick (incumbent) | 325,508 | 39.50% | 19.05 |
| | Independent | John M. King | 16,131 | 1.96% | N/A |
| | Prohibition | Joseph Fred Hyskell | 8,410 | 1.02% | 1.02 |
| | Independent | Henry John Olshaw | 2,395 | 0.29% | N/A |
| | Independent | Jack Marsh (write-in) | 31 | 0.00% | N/A |
| Total votes | Total votes | Total votes | 824,166 | 100.00% | |
| | Democratic gain from Republican | Democratic gain from Republican | Swing | | |