The 1968 United States Senate election in Oregon was held on November 5, 1968. Incumbent Democratic U.S. Senator Wayne Morse was seeking a fifth term, but narrowly lost re-election to 36 year-old Republican State Representative Bob Packwood in a very close race.
The 1988 United States Senate election in Hawaii took place on November 8, 1988. Incumbent Democratic U.S. Senator Spark Matsunaga won re-election to a third and final term.
The 1980 United States Senate election in Hawaii took place on November 4, 1980.
The United States Senate election of 1930 in Massachusetts was held on November 4, 1930 with Democrat Marcus A. Coolidge defeating his challengers.
The 1980 United States Senate election in Oklahoma was held November 3, 1980. Incumbent Republican U.S. Senator Henry Bellmon decided to retire, instead of seeking a third term. Republican nominee Don Nickles won the open seat.
The 1986 United States Senate election in California took place on November 4, 1986. Incumbent Democratic U.S. Senator Alan Cranston narrowly won re-election to a fourth term over Republican U.S. Congressman Ed Zschau.
The 1978 United States Senate election in Michigan was held on November 7, 1978. Incumbent Republican U.S. Senator Robert P. Griffin ran for re-election to a third term, but was defeated by the Democratic candidate, Detroit City Council President Carl Levin.
The 1976 United States Senate election in California took place on November 2, 1976. Incumbent Democratic U.S. Senator John V. Tunney ran for re-election to a second term, but was defeated by Republican S. I. Hayakawa.
The 1946 United States Senate elections in Arizona took place on November 5, 1946. Incumbent Democratic U.S. Senator Ernest McFarland ran for reelection to a second term, easily defeating his Republican challenger Ward S. Powers in the general election.
The 1980 United States Senate election in Arizona took place on November 4, 1980. Incumbent Republican Senator Barry Goldwater decided to run for reelection to a third consecutive term, after returning to the Senate in 1968 following his failed presidential run in 1964 against Lyndon B. Johnson. Despite Republican presidential nominee Ronald Reagan's landslide win in Arizona, Goldwater defeated Democratic Party nominee Bill Schulz in the general election by a narrow margin, which later caused Goldwater to decide against running for reelection to a fourth consecutive term. Goldwater won only three counties, including Maricopa County.
The 1974 United States Senate election in New York was held on November 5, 1974. Incumbent Republican U.S. Senator Jacob Javits won against Democratic challenger Ramsey Clark in a three way election.
The 1970 United States Senate election in Maryland took place on November 3, 1970. Incumbent Democratic U.S. Senator Joseph Tydings ran for re-election to a second term, but was defeated by Republican U.S. Representative J. Glenn Beall Jr.
The 1974 United States Senate election in Arkansas took place on November 5, 1974. Incumbent Democratic U.S. Senator J. William Fulbright ran for re-election to a sixth term in office, but was defeated in the Democratic primary by Governor of Arkansas Dale Bumpers. Bumpers won the general election easily.
The 1918 United States Senate election in Minnesota took place on November 5, 1918. It was the first election for Minnesota's Class 2 seat in the United States Senate, and the second U.S. Senate election in Minnesota overall, held after the ratification of the Seventeenth Amendment to the United States Constitution, which established the popular election of United States Senators. Incumbent U.S. Senator Knute Nelson of the Republican Party of Minnesota easily defeated his challenger in the general election, Willis Greenleaf Calderwood of the National Party, to win a fourth term in the Senate.
The 1962 United States Senate election in Georgia took place on November 5, 1962. Incumbent Democratic U.S. Senator Herman Talmadge was re-elected to a second consecutive term in office, winning large victories in the primary and general elections.
The 1978 United States Senate election in Iowa took place on November 7, 1978. Incumbent Democratic Senator Dick Clark ran for re-election to a second term but was defeated by Republican former Lt. Governor Roger Jepsen. Until 2014, this was the last time Republicans won Iowa's Class II Senate seat.
The 1978 United States Senate election in Kansas took place on November 7, 1978. Incumbent Republican Senator James B. Pearson did not run for re-election to a third full term.
The 1978 United States Senate election in New Hampshire took place on November 7, 1978. Incumbent Democratic Senator Thomas J. McIntyre ran for re-election to a third term but was defeated by Republican Gordon J. Humphrey.
The 1980 United States Senate election in Kansas took place on November 4, 1980. Incumbent Republican U.S. Senator Bob Dole was re-elected to his third term in office, after briefly campaigning for President earlier that year. He defeated Democrat John Simpson, who had previously served in the Kansas State Senate as a Republican.
The 1984 United States Senate election in Oregon took place on November 6, 1984. Incumbent Republican U.S. Senator Mark Hatfield was re-elected to a fourth term in office, defeating Democratic State Senator Margie Hendriksen.
