1940 United States Senate election in Wyoming

none March 2026 September 2023 1940 United States Senate election in Wyoming Wyoming presidential no 1934 United States Senate elections in Wyoming 1934 1946 United States Senate election in Wyoming 1946 November 5, 1940 x150px Sen. Joseph O'Mahoney, LCCN2016876768 (cropped).jpg Joseph C. O'Mahoney Democratic Party (United States) 65,022 58.74% File:Milward Simpson (WY).png Milward Simpson Republican Party (United States) 45,682 41.26% 1940 United States Senate election in Wyoming results map by county.svg 250px County resultsO'Mahoney: #7996e2 50–60% #6674de 60–70% #584CDE 70–80%Simpson: #e27f7f 50–60% U.S. Senator Joseph C. O'Mahoney Democratic Party (United States) Joseph C. O'Mahoney Democratic Party (United States) 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. Democratic primary Candidates Joseph C. O'Mahoney, incumbent U.S. Senator Cecil W. Clark, former Weston County Prosecuting AttorneyMarch 18, 1940 Newcastle Attorney Enters Campaign for Senate Seat Casper Star-Tribune Casper, Wyo. 1 Results Democratic primaryHunt Lester C. 1941 Official Directory of Wyoming and Election Returns for 1940 Casper, Wyo. Prairie Publishing Co. 70–74 1941 Joseph C. O'Mahoney (inc.) Democratic Party (United States) 25,473 90.45% Cecil W. Clark Democratic Party (United States) 2,688 9.55% 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 SenatorFebruary 29, 1940 Harry Henderson In Senate Race Casper Star-Tribune Casper, Wyo. 1 Charles E. Winter, former U.S. Congressman Irving W. Dinsmore, former State SenatorMarch 20, 1940 I. W. DInsmore of Rawlins Enters Race for Senate Casper Star-Tribune Casper, Wyo. 1 R. R. Crow, State RepresentativeJuly 22, 1940 Saratoga Man Enters Race for U.S. Senate: R. R. Crow Is One of Five Republican Candidates; Other Filings Announced Casper Star-Tribune Casper, Wyo. 1 Results Republican primary Milward Simpson Republican Party (United States) 12,014 37.47% Harry B. Henderson, Jr. Republican Party (United States) 8,816 27.49% Charles E. Winter Republican Party (United States) 6,128 19.11% Irving W. Dinsmore Republican Party (United States) 2,910 9.08% R. R. Crow Republican Party (United States) 2,197 6.85% 32,065 100.00% General election Results 1940 United States Senate election in Wyoming Democratic Party (United States) Joseph C. O'Mahoney (inc.) 65,022 58.74% +2.11% Republican Party (United States) Milward Simpson 45,682 41.26% -1.69% 19,340 17.47% +3.80% 110,704 Democratic Party (US) Republican Party (US) References Category:United States Senate elections in Wyoming Wyoming United States Senate