They coincided with the election of President Lyndon B. Johnson by an overwhelming majority, to a full term.

In a close race in Nevada, Democratic incumbent Howard Cannon won re-election over Republican Lieutenant Governor Paul Laxalt by fewer than 100 votes.

Patrick V. McNamara (D–Michigan) later died on April 30, 1966, and was replaced on May 11, 1966, by appointee Robert P. Griffin (R), reducing Democrats' majority to 67–33.

A party defending two-thirds of the seats up for election would not make net gains in the Senate again until 2012.

J. Howard Edmondson Fred R. Harris One Democrat died on April 30, 1966, and was replaced on May 11, 1966, by a Republican appointee.

Goldwater would win the election for the other Senate seat in 1968 when Hayden retired from the post and serving two more terms.

Stennis received 97% of the vote in the Democratic primary and faced no Republican challenger in the general 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.

Senator Howard Cannon won re-election to a second term by a razor-thin margin of only 48 votes over Republican Lieutenant Governor Paul Laxalt.

The Socialist Labor state convention met on March 29, and nominated John Emanuel.

[16] The Conservative state convention met on August 31 at Saratoga Springs, New York, and nominated Prof. Henry Paolucci.

[17] The Democratic state convention met on September 1, and nominated U.S. Attorney General Robert F. Kennedy on the first ballot, with 968 votes against 153 for Congressman Samuel S.

[18] The Liberal Party met on September 1, and endorsed the Democratic nominee, U.S. Attorney General Robert F.

At the time, Samuel S. Stratton, a member of the United States House of Representatives from New York's 35th congressional district, was considered the most likely Democratic candidate.

Kennedy decided to run for the Senate in New York in August, and resigned from the Cabinet on September 3, 1964.

Kennedy responded to these charges in a televised town meeting by saying, "If the senator of the state of New York is going be selected on who's lived here the longest, then I think people are going vote for my opponent.

[1] Only Burdick filed as a Democratic-NPLer, and the endorsed Republican candidate was Thomas S. Kleppe, who would go on to serve two terms as a Representative for North Dakota's second congressional district from 1967 to 1971.

Kerr had died in January 1963, and outgoing Governor J. Howard Edmondson was appointed to take his place.

Senator Hugh Scott successfully sought re-election to a second term, defeating Democratic nominee Genevieve Blatt.

He defeated Republican candidate Howard Baker, who would go on to win the seat in the regular election two years later.

Although Yarborough won this election, he would lose the Democratic Primary six years later, in 1970, to Lloyd Bentsen.