1940 Wisconsin U.S. Senate Election

Wisconsin · 5 candidates · See every 1940 U.S. Senate race

Who won the 1940 Wisconsin U.S. Senate Election?

Robert M. Lafollette Jr. won the 1940 Wisconsin U.S. Senate Election. Robert M. Lafollette Jr. received 605,609 popular votes (45.26%). The main challenger was Fred H. Clausen (41.38%).

See the full head-to-head between Jr. and Clausen

Jr. +3.9 pts · won by 51,917 votes

Robert M. Lafollette Jr.ProgressiveWINNER45.26%

605,609 votes

Fred H. Clausen Republican41.38%

553,692 votes

James E. Finnegan Democratic13.2%

176,688 votes

Ted FurmanIndependent0.1%

1,308 votes

Adolf WiggertIndependent0.06%

838 votes

Popular-vote totals for this U.S. Senate election come from the Constituency-Level Elections Archive (CLEA) and the official public record.

Data last verified July 28, 2026.