1940 United States Senate election in Wyoming
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The 1940 United States Senate election in Wyoming took place on November 5, 1940. Democratic Senator Joseph C. O'Mahoney ran for re-election to a second full term. He faced Republican Milward Simpson, a member of the University of Wyoming Board of Trustees and a former State Representative, in the general election. Though the presidential election in Wyoming was relatively close, O'Mahoney outperformed President Franklin D. Roosevelt, and defeated Simpson in a landslide to win his second term.
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November 5, 1940
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 County results O'Mahoney: 50–60% 60–70% 70–80% Simpson: 50–60% | |||||||||||||||||
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Democratic primary
Candidates
- Joseph C. O'Mahoney, incumbent U.S. Senator
- Cecil W. Clark, former Weston County Prosecuting Attorney[1]
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Joseph C. O'Mahoney (inc.) | 25,473 | 90.45% | |
| Democratic | Cecil W. Clark | 2,688 | 9.55% | |
| Total votes | 28,161 | 100.00% | ||
Republican primary
Candidates
- Milward Simpson, member of the University of Wyoming Board of Trustees, former State Representative
- Harry B. Henderson Jr., State Senator[3]
- Charles E. Winter, former U.S. Congressman
- Irving W. Dinsmore, former State Senator[4]
- R. R. Crow, State Representative[5]
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Milward Simpson | 12,014 | 37.47% | |
| Republican | Harry B. Henderson, Jr. | 8,816 | 27.49% | |
| Republican | Charles E. Winter | 6,128 | 19.11% | |
| Republican | Irving W. Dinsmore | 2,910 | 9.08% | |
| Republican | R. R. Crow | 2,197 | 6.85% | |
| Total votes | 32,065 | 100.00% | ||
General election
Results
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Democratic | Joseph C. O'Mahoney (inc.) | 65,022 | 58.74% | +2.11% | |
| Republican | Milward Simpson | 45,682 | 41.26% | −1.69% | |
| Majority | 19,340 | 17.47% | +3.80% | ||
| Turnout | 110,704 | ||||
| Democratic hold | |||||