The 1940 United States Senate election in Wisconsin was held on November 5, 1940.
Incumbent Progressive U.S. Senator Robert La Follette Jr. was elected to a third term in office over Republican Fred H. Clausen and Democrat James E. Finnegan.
Progressive primary Candidates Robert M. La Follette Jr., incumbent Senator since 1925
Results
Democratic primary
Candidates
Nominee
James E. Finnegan, former Wisconsin Attorney General (1933–1937)
Eliminated in primary William D. Carroll, former State Senator (1933–1937) John Cudahy, former U.S. Ambassador to Poland, Luxembourg, Belgium, and the Irish Free State (write-in) James J. Kerwin
Results
Republican primary Candidates
Nominee
Fred H. Clausen, farming equipment manufacturer
Eliminated in primary Walter B. Chilsen, former State Assemblyman (1919–1921) and editor of the Merrill Daily Herald Michael G. Eberlein Glenn Frank, former President of the University of Wisconsin-Madison (deceased, remained on ballot) John P. Koehler, Health Commissioner of Milwaukee William C. Maas Reuben W. Peterson, former State Assemblyman (1937–1939)
Declined
Frank Bateman Keefe, U.S. Representative from (1939–1951)
Results
General election Candidates Fred H. Clausen, farming equipment manufacturer (Republican) James E. Finnegan, former Wisconsin Attorney General (Democratic) Ted Furman (Communist) Robert M. La Follette Jr., incumbent Senator since 1925 (Progressive) Adolf Wiggert (Socialist Labor)
Results
See also 1940 United States Senate elections
References