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 Attorney
Results
Republican primary Candidates Milward Simpson, member of the University of Wyoming Board of Trustees, former State Representative Harry B. Henderson Jr., State Senator Charles E. Winter, former U.S. Congressman Irving W. Dinsmore, former State Senator R. R. Crow, State Representative
Results
General election Results
References