Robert La Follette Jr. Progressive Robert La Follette Jr. Progressive 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.

Frank died two days before the primary, on September 15, but remained on the ballot.