1940 United States Senate election in Wyoming

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's narrow win, and defeated Simpson in a landslide to win his second term.

1940 United States Senate election in Wyoming

← 1934November 5, 19401946 →
 
NomineeJoseph C. O'MahoneyMilward Simpson
PartyDemocraticRepublican
Popular vote65,02245,682
Percentage58.74%41.26%

U.S. senator before election

Joseph C. O'Mahoney
Democratic

Elected U.S. Senator

Joseph C. O'Mahoney
Democratic

Democratic primary

Candidates

Results

Democratic primary[2]
PartyCandidateVotes%
DemocraticJoseph C. O'Mahoney (inc.) 25,473 90.45%
DemocraticCecil W. Clark2,6889.55%
Total votes28,161 100.00%

Republican primary

Candidates

Results

Republican primary[2]
PartyCandidateVotes%
RepublicanMilward Simpson 12,014 37.47%
RepublicanHarry B. Henderson, Jr.8,81627.49%
RepublicanCharles E. Winter6,12819.11%
RepublicanIrving W. Dinsmore2,9109.08%
RepublicanR. R. Crow2,1976.85%
Total votes32,065 100.00%

General election

Results

1940 United States Senate election in Wyoming[2]
PartyCandidateVotes%±%
DemocraticJoseph C. O'Mahoney (inc.) 65,022 58.74% +2.11%
RepublicanMilward Simpson45,68241.26%-1.69%
Majority19,34017.47%+3.80%
Turnout110,704
Democratic hold

References