The 1990 United States Senate elections were held on Tuesday, November 6, 1990, with the 33 seats of Class 2 contested in regular elections. Special elections were also held to fill vacancies. The Democratic Party increased its majority with a net gain of one seat from the Republican Party. The election took place in the middle of President George H. W. Bush's term, and, as with most other midterm elections, the party not holding the presidency gained seats in Congress.
The 1972 United States Senate elections were held on November 7, with the 33 seats of Class 2 contested in regular elections. They coincided with the landslide re-election of Republican President Richard Nixon. Despite Nixon's landslide victory, Democrats increased their majority by two seats. The Democrats picked up open seats in Kentucky and South Dakota, and defeated four incumbent senators: Gordon Allott of Colorado, J. Caleb Boggs of Delaware, Jack Miller of Iowa, and Margaret Chase Smith of Maine. The Republicans picked up open seats in New Mexico, North Carolina, and Oklahoma, and defeated one incumbent, William B. Spong Jr. of Virginia.
The 1970 United States Senate elections was an election for the United States Senate. It took place on November 3, with the 33 seats of Class 1 contested in regular elections. Special elections were also held to fill vacancies. These races occurred in the middle of Richard Nixon's first term as president. The Democrats lost a net of three seats, while the Republicans and the Conservative Party of New York picked up one net seat each, and former Democrat Harry F. Byrd Jr. was re-elected as an independent.
The 1968 United States Senate elections were elections for the United States Senate. Held on November 5, the 34 seats of Class 3 were contested in regular elections. They coincided with the presidential election of the same year. The Republicans picked up five net seats in the Senate. This saw Republicans win a Senate seat in Florida for the first time since Reconstruction.
The 1966 United States Senate elections were elections on November 8, 1966 for the United States Senate which occurred midway through the second term of President Lyndon B. Johnson. The 33 seats of Class 2 were contested in regular elections. Special elections were also held to fill vacancies. With divisions in the Democratic base over the Vietnam War, and with the traditional mid-term advantage of the party not holding the presidency, the Republicans took three Democratic seats. Despite Republican gains, the balance remained overwhelmingly in favor of the Democrats, who retained a 64–36 majority.
The 1932 United States Senate elections coincided with Democrat Franklin D. Roosevelt's landslide victory over incumbent Herbert Hoover in the presidential election. The 32 seats of Class 3 were contested in regular elections, and special elections were held to fill vacancies.
The 1930 United States Senate elections occurred in the middle of Republican President Herbert Hoover's term. The 32 seats of Class 2 were contested in regular elections, and special elections were held to fill vacancies. 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 during the Depression in which Democrats made enormous gains, achieving a cumulative pick-up of 34 seats.
The 1948 United States Senate election in Louisiana was held on November 2, 1948. Incumbent Senator Allen J. Ellender was re-elected to a third term in office.
The 1932 United States Senate election in Louisiana was held on November 8, 1932. Incumbent Democratic Senator Edwin Broussard ran for a third term in office, but was defeated in the primary by U.S. Representative John H. Overton.
The 1920 United States Senate election in Louisiana was held on November 2, 1920. Incumbent Senator Edward J. Gay did not run for re-election.
The 1956 United States Senate election in Louisiana was held on November 6, 1956. Incumbent Democratic U.S. Senator Russell B. Long won re-election to a third term.
The 1950 United States Senate election in Louisiana was held on November 7, 1950. Incumbent Democratic U.S. Senator Russell B. Long won re-election to a second term.
The 1926 United States Senate election in Louisiana was held on November 2, 1926. Incumbent Democratic Senator Edwin Broussard was elected to a second term in office.
The 1930 United States Senate election in Louisiana was held on November 4, 1930.
The 1966 United States Senate election in Georgia was held on November 8, 1966. Incumbent Democratic Senator Richard Russell Jr. was elected to a seventh term in office.
The 1944 United States Senate election in Louisiana was held on November 7, 1944. Incumbent Democratic Senator John H. Overton was elected to a third term in office.
The 1954 United States Senate election in Louisiana was held on November 2, 1954. Incumbent Senator Allen J. Ellender was re-elected to a fourth term in office.
The 1962 United States Senate election in Louisiana was held on November 6, 1962. Incumbent Democratic Senator Russell Long was elected to a fourth term in office.
The 1966 United States Senate election in Louisiana was held on November 8, 1966. Incumbent Democratic Senator Allen Ellender was elected to a sixth term in office.
The 1974 United States Senate election in Louisiana was held on November 5, 1974. Incumbent Democratic Senator Russell Long was elected to a sixth term in office.
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