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County results Culver: 40–50% 50–60% 60–70% Stanley: 40-50% 50-60% 60-70% 70-80% | |||||||||||||||||
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The1974 United States Senate election in Iowa took place on November 5, 1974. Incumbent Democratic U.S. SenatorHarold E. Hughes retired. The open seat was won by U.S. RepresentativeJohn C. Culver, defeating Republican State RepresentativeDavid M. Stanley. As of 2022[update], this was the most recent election in which a Democrat, or anyone other thanChuck Grassley, has won the Class 3 Senate seat in Iowa.

| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | David M. Stanley | 87,464 | 66.93% | |
| Republican | George Milligan | 43,206 | 33.06% | |
| Write-in | All others | 6 | 0.01% | |
| Total votes | 130,676 | 100.00% | ||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Democratic | John C. Culver | 462,947 | 52.04% | ||
| Republican | David M. Stanley | 420,546 | 47.28% | ||
| American Independent | Lorin Oxley | 6,028 | 0.68% | N/A | |
| Write-ins | 40 | 0.00% | N/A | ||
| Total votes | 889,561 | 100.00% | |||
| Democratichold | Swing | ||||