1940 United States Senate election in Minnesota

1940 United States Senate election in Minnesota
	County results; Shipstead: 30–40% 40–50% 50–60% 60–70% 70–80%; Benson: 40–50%
U.S. senator before election; Henrik Shipstead; Farmer–Labor	Elected U.S. Senator ; Henrik Shipstead; Republican

The 1940 United States Senate election in Minnesota took place on November 5, 1940. Incumbent U.S. Senator Henrik Shipstead defected to the Republican Party of Minnesota from the Farmer–Labor Party of Minnesota, and defeated former Governor Elmer Benson of the Farmer–Labor Party and John E. Regan of the Minnesota Democratic Party to win a fourth term.

Democratic primary

Louis Erickson
John E. O'Rourke, Former Minnesota State Representative from the 27th district (1935-1937)
John E. Regan, 1932 Democratic gubernatorial nominee and former Minnesota State Representative from the 8th district (1931-1933)
Joseph Wolf

Democratic primary election results^[1]
Party		Candidate	Votes	%
	Democratic	John E. Regan	50,328	52.31%
	Democratic	Joseph Wolf	20,759	21.58%
	Democratic	Louis Erickson	13,966	14.52%
	Democratic	John E. O'Rourke	11,154	11.59%
Total votes			96,207	100.00%

Elmer A. Benson, 24th Governor of Minnesota (1937-1939) and former U.S. Senator (1935-1936)
George H. Lommen, Minnesota State Senator from the 61st district since 1927

Farmer–Labor primary election results^[1]
Party		Candidate	Votes	%
	Farmer–Labor	Elmer A. Benson	79,245	61.90%
	Farmer–Labor	George H. Lommen	48,781	38.10%
Total votes			128,026	100.00%

Ben Andreen
Ray P. Chase, Former U.S. Representative (1933-1935) and 9th Minnesota State Auditor (1921-1931)
Michael Ferch
O. J. Hagen
Asher Howard, Former Minnesota State Representative from the 34th district (1917-1923)
Martin A. Nelson, 1934 and 1936 Republican gubernatorial nominee (unsuccessful)
Henrik Shipstead, Incumbent U.S. Senator since 1923
Engelberth Zeiner

Republican primary election results^[1]
Party		Candidate	Votes	%
	Republican	Henrik Shipstead (Incumbent)	168,876	51.37%
	Republican	Martin A. Nelson	97,812	29.75%
	Republican	Ray P. Chase	35,697	10.86%
	Republican	Ben Andreen	13,858	4.22%
	Republican	O. J. Hagen	5,810	1.77%
	Republican	Asher Howard	3,313	1.01%
	Republican	Michael Ferch	1,712	0.52%
	Republican	Engelberth Zeiner	1,660	0.50%
Total votes			328,738	100.00%

General election results^[2]
Party		Candidate	Votes	%
	Republican	Henrik Shipstead (Incumbent)	641,049	53.01%
	Farmer–Labor	Elmer A. Benson	310,875	25.71%
	Democratic	John E. Regan	248,658	20.56%
	Trotskyist Anti-War	Grace Holmes Carlson	8,761	0.72%
	Independent	Carl Winter	256	0.02
Total votes			1,209,343	100.00%
Majority			330,174	27.30%
	Republican gain from Farmer–Labor