United States Senate elections, 1964

November 3, 1964

33 of the 100 seats in the United States Senate, plus 2 mid-term vacancies 51 seats needed for a majority

	Majority party	Minority party

Leader	Mike Mansfield	Everett Dirksen
Party	Democratic	Republican
Leader's seat	Montana	Illinois
Last election	66 seats	34 seats
Seats won	68	32
Seat change	2	2
Popular vote	30,217,130	22,654,661
Percentage	56.3%	42.2%
Swing	5.9%	6.8%
Seats up	26	9

Democratic gain Democratic hold
Republican gain Republican hold

Majority Leader before election

Mike Mansfield
Democratic

Elected Majority Leader

Mike Mansfield
Democratic

The United States Senate election in 1964 coincided with the election of President Lyndon B. Johnson by an overwhelming majority, to a full term. His Democratic Party picked up a net two seats from the Republicans. As of 2016, this is the last time either party has had a two-thirds majority in the Senate, which would have hypothetically allowed the Senate Democrats to override a veto, impeach and remove certain officials, or invoke cloture without any votes from Republicans. (In reality, both parties were then badly divided on many issues so that would have been very unlikely.) The Senate election coincided with Democratic gains in the House in the same year.

Notably, of the 34 seats up for election this year, 25 of were held by Democrats, who managed to retain 24 of them. A party defending 2/3 of the seats up for election would not make net gains in the Senate again until 2012.

Future President George H. W. Bush ran for a seat in Texas, but lost.

Change in Senate composition

Before the elections

D₄₁	D₄₂	D₄₃	D₄₄	D₄₅	D₄₆	D₄₇	D₄₈	D₄₉	D₅₀
D₁	D₂	D₃	D₄	D₅	D₆	D₇	D₈	D₉	D₁₀
D₂₀	D₁₉	D₁₈	D₁₇	D₁₆	D₁₅	D₁₄	D₁₃	D₁₂	D₁₁
D₂₁	D₂₂	D₂₃	D₂₄	D₂₅	D₂₆	D₂₇	D₂₈	D₂₉	D₃₀
D₄₀	D₃₉	D₃₈	D₃₇	D₃₆	D₃₅	D₃₄	D₃₃	D₃₂	D₃₁
Majority →									D₅₁
D₆₀	D₅₉	D₅₈	D₅₇	D₅₆	D₅₅	D₅₄	D₅₃	D₅₂
D₆₁	D₆₂	D₆₃	D₆₄	D₆₅	D₆₆	R₃₄	R₃₃	R₃₂	R₃₁
R₂₁	R₂₂	R₂₃	R₂₄	R₂₅	R₂₆	R₂₇	R₂₈	R₂₉	R₃₀
R₂₀	R₁₉	R₁₈	R₁₇	R₁₆	R₁₅	R₁₄	R₁₃	R₁₂	R₁₁
R₁	R₂	R₃	R₄	R₅	R₆	R₇	R₈	R₉	R₁₀

As a result of the elections

D₄₁√	D₄₂√	D₄₃√	D₄₄√	D₄₅√	D₄₆√	D₄₇√	D₄₈√	D₄₉√	D₅₀√
D₁	D₂	D₃	D₄	D₅	D₆	D₇	D₈	D₉	D₁₀
D₂₀	D₁₉	D₁₈	D₁₇	D₁₆	D₁₅	D₁₄	D₁₃	D₁₂	D₁₁
D₂₁	D₂₂	D₂₃	D₂₄	D₂₅	D₂₆	D₂₇	D₂₈	D₂₉	D₃₀
D₄₀	D₃₉	D₃₈	D₃₇	D₃₆	D₃₅	D₃₄	D₃₃	D₃₂	D₃₁
Majority →									D₅₁√
D₆₀√	D₅₉√	D₅₈√	D₅₇√	D₅₆√	D₅₅√	D₅₄√	D₅₃√	D₅₂√
D₆₁√	D₆₂√	D₆₃√	D₆₄O	D₆₅O	D₆₆+	D₆₇+	D₆₈+	R₃₂+	R₃₁O
R₂₁	R₂₂	R₂₃	R₂₄	R₂₅	R₂₆√	R₂₇√	R₂₈√	R₂₉√	R₃₀√
R₂₀	R₁₉	R₁₈	R₁₇	R₁₆	R₁₅	R₁₄	R₁₃	R₁₂	R₁₁
R₁	R₂	R₃	R₄	R₅	R₆	R₇	R₈	R₉	R₁₀

Key:

D_#	Democratic
R_#	Republican

√	Incumbent re-elected or appointee elected to finish term
O	Party hold: New senator elected from same party
+	Party gain: New senator elected from different party

Retirements

Republicans replaced by Republicans

Arizona: Barry Goldwater retired to run for President. He was replaced by Paul Fannin (R)

Democrats replaced by Democrats

Tennessee (Class 2): Appointee Herbert S. Walters (D) was replaced by Ross Bass (D)

Incumbents who lost elections

Democrats lost to Republicans

California: Appointee Pierre Salinger (D) lost to George Murphy (R) for the next term

Democrats lost to Democrats

Oklahoma (Class 2): Appointee J. Howard Edmondson (D) lost nomination to Fred R. Harris (D), who won the general election

Republicans lost to Democrats

Maryland: James Glenn Beall (R) lost to Joseph D. Tydings (D)
New Mexico: Edwin L. Mechem (R) lost to Joseph M. Montoya (D)
New York: Kenneth B. Keating (R) lost to Robert F. Kennedy (D)

Other races

In a close race in Nevada, Democratic incumbent Howard Cannon won re-election over Republican Lieutenant Governor Paul Laxalt by fewer than 100 votes. Laxalt joined Cannon in the Senate when he won Nevada's other seat in 1974.

Subsequent gains

Michigan: Patrick V. McNamara (D) died April 30, 1966, and was replaced May 11, 1966 by appointee Robert P. Griffin (R).

Complete list of races

Bold state indicates a separate article on that election.

Bold candidate indicates the winner.

State	Incumbent	Party	Result	Other candidates
Arizona	Barry Goldwater	Republican	Retired Republican hold	Paul Fannin (Republican) 51.4% Roy Elson (Democratic) 48.6%
California	Pierre Salinger	Democratic	Appointee lost election to next term Republican gain	George Murphy (Republican) 51.5% Pierre Salinger (Democratic) 48.5%
Connecticut	Thomas J. Dodd	Democratic	Re-elected	Thomas J. Dodd (Democratic) 64.6% John Davis Lodge (Republican) 35.3%
Delaware	John J. Williams	Republican	Re-elected	John J. Williams (Republican) 51.7% Elbert N. Carvel (Democratic) 48.3% Hollon (Socialist Labor) 0.03%
Florida	Spessard Holland	Democratic	Re-elected	Spessard Holland (Democratic) 63.9% Claude R. Kirk, Jr. (Republican) 36.0%
Hawaii	Hiram L. Fong	Republican	Re-elected	Hiram L. Fong (Republican) 53.0% Thomas P. Gill (Democratic) 46.4% Lawrence Domine (Independent) 0.6%
Indiana	Vance Hartke	Democratic	Re-elected	Vance Hartke (Democratic) 54.3% D. Russell Bontrager (Republican) 45.3% J. Ralston Miller (Prohibition) 0.3% Casimer Kanczuzewski (Socialist Labor) 0.06%
Maine	Edmund S. Muskie	Democratic	Re-elected	Edmund S. Muskie (Democratic) 66.6% Clifford McIntire (Republican) 33.4%
Maryland	James Glenn Beall	Republican	Lost re-election Democratic gain	Joseph D. Tydings (Democratic) 62.8% James Glenn Beall (Republican) 37.2%
Massachusetts	Ted Kennedy	Democratic	Re-elected	Ted Kennedy (Democratic) 74.3% Howard Whitmore, Jr. (Republican) 25.4% Lawrence Gilfedder (Socialist Labor) 0.2% Grace F. Luder (Prohibition) 0.1%
Michigan	Philip A. Hart	Democratic	Re-elected	Philip A. Hart (Democratic) 64.4% Elly M. Peterson (Republican) 35.3% Ernest C. Smith (Freedom Now) 0.1% Evelyn Sell (Socialist Workers) 0.09% James Sim (Socialist Labor) 0.05%
Minnesota	Eugene McCarthy	Democratic	Re-elected	Eugene McCarthy (Democratic) 60.3% Wheelock Whitney (Republican) 39.3% William Braatz (Industrial Government) 0.3% Everett E. Luoma (Socialist Workers) 0.1%
Mississippi	John C. Stennis	Democratic	Re-elected	John C. Stennis (Democratic) unopposed
Missouri	Stuart Symington	Democratic	Re-elected	Stuart Symington (Democratic) 66.6% Jean P. Bradshaw (Republican) 33.4%
Montana	Mike Mansfield	Democratic	Re-elected	Mike Mansfield (Democratic) 64.5% Alex Blewett (Republican) 35.5%
Nebraska	Roman L. Hruska	Republican	Re-elected	Roman L. Hruska (Republican) 61.4% Raymond W. Arndt (Democratic) 38.6%
Nevada	Howard W. Cannon	Democratic	Re-elected	Howard W. Cannon (Democratic) 50.0% Paul Laxalt (Republican) 50.0%
New Jersey	Harrison A. Williams, Jr.	Democratic	Re-elected	Harrison A. Williams, Jr. (Democratic) 61.9% Bernard M. Shanley (Republican) 37.3%
New Mexico	Edwin L. Mechem	Republican	Lost re-election Democratic gain	Joseph M. Montoya (Democratic) 54.7% Edwin L. Mechem (Republican) 45.3%
New York	Kenneth B. Keating	Republican	Lost re-election Democratic gain	Robert F. Kennedy (Democratic) 53.5% Kenneth B. Keating (Republican) 43.4%
North Dakota	Quentin N. Burdick	Democratic	Re-elected	Quentin N. Burdick (Democratic) 57.6% Thomas S. Kleppe (Republican) 42.4%
Ohio	Stephen M. Young	Democratic	Re-elected	Stephen M. Young (Democratic) 50.2% Robert A. Taft, Jr. (Republican) 49.8%
Oklahoma Special: Class 2	J. Howard Edmondson	Democratic	Appointee lost nomination to finish term Democratic hold	Fred R. Harris (Democratic) 51.2% Bud Wilkinson (Republican) 48.8%
Pennsylvania	Hugh Scott	Republican	Re-elected	Hugh Scott (Republican) 50.6% Genevieve Blatt (Democratic) 49.1%
Rhode Island	John O. Pastore	Democratic	Re-elected	John O. Pastore (Democratic) 82.7% Ronald R. Lagueux (Republican)
Tennessee	Albert Gore, Sr.	Democratic	Re-elected	Albert Gore, Sr. (Democratic) 53.6% Dan H. Kuykendall (Republican) 46.4%
Tennessee Special: Class 2	Herbert S. Walters	Democratic	Appointee retired Democratic hold	Ross Bass (Democratic) 52.1% Howard H. Baker, Jr. (Republican) 47.4%
Texas	Ralph Yarborough	Democratic	Re-elected	Ralph Yarborough (Democratic) 56.2% George H. W. Bush (Republican) 43.6%
Utah	Frank E. Moss	Democratic	Re-elected	Frank E. Moss (Democratic) 57.3% Ernest L. Wilkinson (Republican) 42.7%
Vermont	Winston L. Prouty	Republican	Re-elected	Winston L. Prouty (Republican) 53.5% Frederick J. Fayette (Democratic) 46.5%
Virginia	Harry F. Byrd	Democratic	Re-elected	Harry F. Byrd (Democratic) 63.8% Richard A. May (Republican) 19.0% James W. Respess (Independent) 10.3%
Washington	Henry M. Jackson	Democratic	Re-elected	Henry M. Jackson (Democratic) 72.2% Lloyd J. Andrews (Republican) 27.8%
West Virginia	Robert C. Byrd	Democratic	Re-elected	Robert C. Byrd (Democratic) 67.7% Cooper P. Benedict (Republican) 32.3%
Wisconsin	William Proxmire	Democratic	Re-elected	William Proxmire (Democratic) 53.3% Wilbur N. Renk (Republican) 46.6%
Wyoming	Gale McGee	Democratic	Re-elected	Gale McGee (Democratic) 54.0% John S. Wold (Republican) 46.0%

External links

"Statistics of the Presidential and Congressional Election of November 3, 1964" (PDF). U.S. Government Printing Office. 1965.

United States Senate elections

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