The 1978 United States Senate elections in the middle of Democratic President Jimmy Carter's term. Thirteen seats changed hands between parties. The Democrats at first lost a net of two seats to the Republicans, and then one more in a special election. Democrats nevertheless retained a 58-41 majority.
The 1964 United States Senate elections 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 2019, 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, convict and expel certain officials, or invoke cloture without any votes from Republicans. The Senate election coincided with Democratic gains in the House in the same year.
The 1950 United States Senate elections occurred in the middle of Harry S. Truman's second term as President. As with most 20th-century second-term mid-terms, the party out of the Presidency made significant gains. The Republican opposition made a net gain of five seats, taking advantage of the Democratic administration's declining popularity during the Cold War and the aftermath of the Recession of 1949. The Democrats held a narrow 49 to 47 seat majority after the election. This became the first time since 1932 that the Senate Majority Leader lost his seat and the only instance where the majority leader lost his seat while his party retained the majority.
The 1948 United States Senate elections were elections which coincided with the election of Democratic President Harry S. Truman for a full term. Truman had campaigned against an "obstructionist" Congress that had blocked many of his initiatives, and in addition the U.S. economy recovered from the postwar recession of 1946–47 by election day. Thus Truman was rewarded with a Democratic gain of nine seats in the Senate, enough to give them control of the chamber.
The 1946 United States Senate elections were held November 5, 1946, in the middle of Democratic President Harry S. Truman's first term.
The United States Senate elections of 1944 coincided with the re-election of Franklin D. Roosevelt to his fourth term as President. The Democrats' large majority remained the same, but they lost one seat to the Republicans in a special election.
The United States Senate elections of 1932 coincided with Democrat Franklin D. Roosevelt's crushing defeat of incumbent Herbert Hoover in the presidential election. With the Hoover administration widely blamed for the Great Depression, Republicans lost twelve seats and control of the chamber.
The United States Senate elections of 1930 occurred in the middle of Republican President Herbert Hoover's term. With the Great Depression beginning to take hold, Republican incumbents became unpopular, and Democrats picked up a net of eight seats, erasing the Republican gains from the previous election cycle. Republicans retained control of the U.S. Senate since Vice President Charles Curtis cast the tie-breaking vote. This was the first of four consecutive Senate elections in the Depression in which Democrats made enormous gains, achieving a cumulative pick-up of 34 seats.
The 1982 United States House of Representatives elections was an election for the United States House of Representatives held on November 2, 1982, in the middle of President Ronald Reagan's first term, whose popularity was sinking due to economic conditions under the 1982 recession. The President's Republican Party lost seats in the House, which could be viewed as a response to the President's approval at the time. Unlike most midterm election cycles, the number of seats lost—26 seats to the Democratic Party—was a comparatively large swap. It included most of the seats that had been gained the previous election, cementing the Democratic majority. Coincidentally, the number of seats the Democratic picked up (26), was the exact amount the Republicans needed to win the House majority.
The 1869 United States Senate election in New York was held on January 19, 1869, by the New York State Legislature to elect a U.S. Senator to represent the State of New York in the United States Senate.
The 1984 United States Senate election in Nebraska was held on November 6, 1984. Incumbent Democratic U.S. Senator J. James Exon won re-election to a second term.
The 1934 United States Senate election in Minnesota took place on November 6, 1934. Incumbent Farmer-Labor U.S. Senator Henrik Shipstead defeated former State Senator Nathaniel J. Holmberg of the Republican Party of Minnesota and U.S. Representative Einar Hoidale of the Minnesota Democratic Party to win a third term.
The 1944 United States Senate election in Pennsylvania was held on November 7, 1944. Incumbent Republican U.S. Senator James J. Davis sought re-election, but was defeated by Democratic nominee Francis J. Myers.
The 1932 United States Senate elections in Arizona took place on November 8, 1932. Incumbent Democratic U.S. Senator Carl Hayden ran for reelection to a second term, again defeating his 1926 challenger former U.S. Senator Ralph H. Cameron in the general election.
The 1956 United States Senate election in Pennsylvania was held on November 6, 1956. Incumbent Republican U.S. Senator James H. Duff sought re-election to another term, but was defeated by the Democratic nominee, Joseph S. Clark, Jr.
The 1930 United States Senate special election in Pennsylvania was held on November 4, 1930. Joseph R. Grundy, incumbent Republican appointed to fill the vacancy created by the unseating of William Scott Vare, was defeated for re-nomination. The Republican nominee, James J. Davis, defeated Democratic nominee Sedgwick Kistler to win the election.
The 1938 United States Senate election in Pennsylvania was held on November 8, 1938. Incumbent Republican U.S. Senator James J. Davis successfully sought re-election, defeating Democratic nominee George Howard Earle III.
The 1950 United States Senate election in Pennsylvania was held on November 7, 1950. Incumbent Democratic U.S. Senator Francis J. Myers sought re-election, but was defeated by Republican nominee James H. Duff.
The 1940 United States Senate election in Missouri was held on November 5, 1940. Incumbent Democratic U.S. Senator and future President of the United States Harry S. Truman, who was first elected in 1934, decided to seek re-election to a second term. He narrowly defeated Republican nominee Manvel H. Davis.
The 1948 United States Senate election in Montana took place on November 2, 1948. Incumbent United States Senator James E. Murray, who was first elected to the Senate in a special election in 1934 and was re-elected in 1936 and 1942, ran for re-election. After winning the Democratic primary, he faced Tom J. Davis, an attorney and the Republican nominee, in the general election. Following a narrow re-election in 1936, Murray significantly expanded his margin of victory and comfortably won re-election over Davis, resulting in him winning his fourth term and his third full term in the Senate.
