1964 United States Senate election in Montana

The 1964 United States Senate election in Montana took place on November 3, 1964. Incumbent United States Senator Mike Mansfield, who was first elected to the Senate in 1952 and was re-elected in 1958, ran for re-election. Mansfield won the Democratic primary in a landslide, and advanced to the general election, where he faced Alex Blewett, the Majority Leader of the Montana House of Representatives and the Republican nominee. Though Mansfield's margin was significantly reduced from 1958, he still overwhelmingly defeated Blewett and won his third term in the Senate.

1964 United States Senate election in Montana

November 3, 1964

Nominee Mike Mansfield Alex Blewett Party Democratic Republican Popular vote 180,643 99,367 Percentage 64.51% 35.49%

County results Mansfield:      50–60%      60–70%      70–80% Blewett:      50-60%

U.S. senator before election Mike Mansfield Democratic Elected U.S. Senator Mike Mansfield Democratic

Democratic primary

Candidates

• Mike Mansfield, incumbent United States Senator
• Joseph P. Monaghan, former United States Congressman from Montana's 1st congressional district, 1936 independent candidate for the United States Senate

Results

Democratic Party primary results[1]

Party		Candidate	Votes	%
	Democratic	Mike Mansfield (inc.)	109,904	85.51
	Democratic	Joseph P. Monaghan	18,630	14.49
Total votes			128,534	100.00

Republican primary

Candidates

• Alex Blewett, Majority Leader of the Montana House of Representatives
• Lyman Brewster, rancher
• Antoinette F. Rosell, State Representative

Results

Republican Primary results[1]

Party		Candidate	Votes	%
	Republican	Alex Blewett	31,934	59.37
	Republican	Lyman Brewster	12,375	23.01
	Republican	Antoinette F. Rosell	9,480	17.62
Total votes			53,789	100.00

General election

Results

United States Senate election in Montana, 1964[2]

Party		Candidate	Votes	%	±%
	Democratic	Mike Mansfield (inc.)	180,643	64.51%	-11.71%
	Republican	Alex Blewett	99,367	35.49%	+11.71%
Majority			81,276	29.03%	-23.41%
Turnout			280,010
	Democratic hold		Swing

References

1. "Report of the Official Canvass of the Vote Cast at the Primary Election Held in the State of Montana, June 2, 1964". Montana Secretary of State. Retrieved July 2, 2014.
2. "Statistics of the Presidential and Congressional Election of November 3, 1964" (PDF). Clerk of the United States House of Representatives. Retrieved July 4, 2014.