The 1964 United States Senate election in Wisconsin was held on November 3, 1964. Incumbent Democrat William Proxmire was re-elected to a second full term in office over Republican Wilbur Renk.
Democratic primary
Candidates
Kenneth F. Klinkert
William Proxmire , incumbent senator since 1957
Arlyn F. Wollenburg
Results
After losing the primary, Klinkert entered the general election as a candidate running on a "Faith and Belief in Man" ticket.
Republican primary
Candidates
Wilbur N. Renk, candidate for governor in 1962
Results
1964 Republican U.S. Senate primary[ 1]
Party
Candidate
Votes
%
Republican
Wilbur N. Renk
300,258
100.00%
Total votes
300,258
100.00%
General election
Candidates
Wayne Leverenz (Socialist Workers)
Kenneth F. Klinkert (Faith and Belief in Man)
William Proxmire , incumbent Senator (Democratic)
Wilbur N. Renk, candidate for governor in 1962 (Republican)