PolitiFinder

1958 Montana U.S. Senate Election

Montana · 2 candidates · See every 1958 U.S. Senate race

Who won the 1958 Montana U.S. Senate Election?

Mike Mansfield won the 1958 Montana U.S. Senate Election. Mike Mansfield received 174,910 popular votes (76.22%). The main challenger was Lou W. Welch (23.78%).

See the full head-to-head between Mansfield and Welch

Mansfield +52.4 pts · won by 120,337 votes
Mike MansfieldDemocraticWINNER76.22%
174,910 votes
Lou W. WelchRepublican23.78%
54,573 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.