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 cycle 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 1984 United States Senate elections were held on November 6, with the 33 seats of Class 2 contested in regular elections. They coincided with the landslide re-election of President Ronald Reagan in the presidential election. In spite of the lopsided presidential race, Reagan's Republican Party suffered a net loss of two Senate seats to the Democrats, although it retained control of the Senate with a reduced 53–47 majority. Democrats defeated incumbents in Illinois and Iowa, and won an open seat in Tennessee, while Republicans defeated an incumbent in Kentucky.
The 1978 United States Senate elections were held on November 7, in the middle of Democratic President Jimmy Carter's term. The 33 seats of Class 2 were contested in regular elections. Special elections were also held to fill vacancies.
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 1946 United States Senate elections were held November 5, 1946, in the middle of Democratic President Harry S. Truman's first term after Roosevelt's passing. The 32 seats of Class 1 were contested in regular elections, and four special elections were held to fill vacancies. The Republicans took control of the Senate by picking up twelve seats, mostly from the Democrats. This was the first time since 1932 that the Republicans had held the Senate, recovering from a low of 16 seats following the 1936 Senate elections.
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 2008 Delaware gubernatorial election took place on November 4, 2008, coinciding with the United States presidential election. Democratic state Treasurer Jack Markell defeated Republican William Swain Lee in a landslide, succeeding incumbent Ruth Ann Minner, also a Democrat, who was prevented from running for a third term.
The 2008 United States Senate election in Delaware was held on November 4, 2008. Incumbent Senator Joe Biden, who was also the Democratic nominee for vice president in the concurrent presidential election, faced Christine O'Donnell in the general election. Biden won re-election to a seventh term with 64.69% of the vote, his best-performing result in his senatorial career, while also being elected vice president. Biden took his oath of office in the Senate chamber with the rest of his colleagues on January 3, 2009, but resigned his seat on January 15, 2009, and assumed the vice presidency five days later. Delaware Governor Ruth Ann Minner appointed Ted Kaufman, a Democrat and longtime Biden advisor, to fill the vacant seat pending a 2010 special election in which O'Donnell once again ran unsuccessfully for the seat, being defeated by Democrat Chris Coons.
The 1972 United States Senate election in Delaware was held November 7, 1972. Incumbent Republican Senator J. Caleb Boggs ran for a third term in the United States Senate. Boggs faced off against Democrat Joe Biden, a New Castle County Councilman. Though Boggs was expected to easily win a third term, Biden narrowly defeated the incumbent on election day, even while fellow Democrat George McGovern lost Delaware by 20.4% in the concurrent presidential election. Biden's victory margin of 3,162 votes made this the closest U.S. Senate election of the year.
The 2002 United States Senate election in Delaware was held on November 5, 2002. Incumbent Democratic U.S. Senator Joe Biden won re-election to a sixth term, defeating Raymond Clatworthy in a rematch. This is the last Senate election that Biden decreased his percentage of the votes since the previous election and the only time Biden lost Kent County in his seven elections to the Senate.
The 1992 United States Senate election in Maryland was held on November 3, 1992. Incumbent Democratic U.S. Senator Barbara Mikulski won re-election to a second term.
Elections were held in Delaware on Tuesday, November 2, 2010. Primary elections were held on September 14, 2010.
The 1976 United States Senate election in Delaware took place on November 2, 1976. Incumbent Republican U.S. Senator Bill Roth won reelection to a second term.
The 1984 United States Senate election in Delaware was held on November 6, 1984. Incumbent Democratic Senator Joe Biden won re-election to a third term, defeating Republican challenger John M. Burris. Delaware was one of sixteen states alongside Alabama, Arkansas, Georgia, Illinois, Iowa, Louisiana, Massachusetts, Michigan, Montana, Nebraska, New Jersey, Oklahoma, Rhode Island, Tennessee and West Virginia won by Republican President Ronald Reagan in 1984 that elected a Democrat to the United States Senate.
The 1978 United States Senate election in Alaska was held on November 7, 1978. Incumbent Republican U.S. Senator Ted Stevens was re-elected to a third term in office, defeating Democrat Donald Hobbs.
The 2018 United States Senate election in Delaware took place on November 6, 2018, to elect a member of the United States Senate to represent the State of Delaware, concurrently with other elections to the United States Senate, elections to the United States House of Representatives, and various state and local elections.
The 2020 United States Senate election in Delaware was held on November 3, 2020, to elect a member of the United States Senate to represent the State of Delaware, concurrently with the 2020 U.S. presidential election, as well as other elections to the United States Senate, elections to the United States House of Representatives, and various state and local elections.
James H. Baxter Jr. was a farmer and politician from Delaware.
