PolitiFinder

1966 Oregon U.S. Senate Election

Oregon · 2 candidates · See every 1966 U.S. Senate race

Who won the 1966 Oregon U.S. Senate Election?

Mark O. Hatfield won the 1966 Oregon U.S. Senate Election. Mark O. Hatfield received 354,391 popular votes (51.75%). The main challenger was Robert B. Holmes (48.25%).

See the full head-to-head between Hatfield and Holmes

Hatfield +3.5 pts · won by 24,017 votes
Mark O. HatfieldRepublicanWINNER51.75%
354,391 votes
Robert B. HolmesDemocratic48.25%
330,374 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 August 15, 2026.