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.
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 2008 United States Senate election in Illinois was held on November 4, 2008. Incumbent Democratic U.S. Senator Dick Durbin sought a third term in office and faced minimal opposition from Republican Steve Sauerberg. As expected, Durbin overwhelmingly won re-election. On the same night, fellow Democratic Senator Barack Obama was elected President of the United States, defeating Republican Senator John McCain of Arizona.
The 1990 United States Senate election in Illinois was held on November 6, 1990. Incumbent Democratic U.S. Senator Paul Simon sought re-election to a second term in office. Simon was opposed by Republican nominee Lynn Morley Martin, a U.S. Congresswoman from Illinois's 16th congressional district, whom he easily defeated to win a second and final term in the Senate.
The 1984 United States Senate election in Illinois took place on November 6, 1984. Incumbent Republican Senator Charles H. Percy ran for re-election to a fourth term in the United States Senate. Senator Percy was opposed by Democratic nominee Paul Simon, who was a United States Congressman from Illinois's 22nd congressional district. The campaign between Percy and Simon was contentious and brutally fought, and ended up with Simon ousting Percy by fewer than 90,000 votes, which was, at the time, considered an upset. Incidentally, Percy's son-in-law Jay Rockefeller was elected Senator from West Virginia in the same election cycle.
The 1978 United States Senate election in Illinois took place on November 7, 1978. Incumbent Republican United States Senator Charles H. Percy ran for re-election to a third term in the United States Senate. Percy was opposed by Democratic nominee Alex Seith, an attorney who had been appointed to several local government positions.
The 1966 United States Senate election in Illinois took place on November 8, 1966. Incumbent Democratic United States Senator Paul Douglas, seeking a fourth term in the United States Senate, faced off against Republican Charles H. Percy, a businessman and the 1964 Republican nominee for Governor of Illinois. A competitive election ensued, featuring campaign appearances by former vice president Richard M. Nixon on behalf of Percy. Ultimately, Percy ended up defeating Senator Douglas by a fairly wide margin, allowing him to win what would be the first of three terms in the Senate.
Elections were held in Illinois on Tuesday, November 2, 2010. Primary elections were held on February 2, 2010.
The 1986 United States Senate election in Illinois was held on November 4, 1986. The incumbent Democrat U.S. Senator Alan J. Dixon won re-election to a second term. Until 2022, this was the most recent election in which an incumbent Senator won re-election to Illinois' Class 3 seat and was elected to more than one full term.
The 1980 United States Senate election in Illinois was held on November 4, 1980. Incumbent Democrat U.S. Senator Adlai Stevenson III decided to retire. Democrat Alan J. Dixon won the open seat.
The 1978 Illinois gubernatorial election was held on Tuesday, November 7, 1978. Republican James R. Thompson easily won a second term in office, defeating Democratic nominee Michael Bakalis by nearly 600,000 votes.
The 1972 United States presidential election in Illinois was held on November 7, 1972 as part of the 1972 United States presidential election. Incumbent President Richard Nixon won the state of Illinois with 59.03 percent of the vote, carrying the state's 26 electoral votes. He defeated his main opponent, Democratic candidate George McGovern in Illinois by a large margin of 18.52%, which still left Illinois 4.63% more Democratic than the nation.
The United States Senate election in Illinois of 1954 took place on November 2, 1954. Incumbent Democratic United States Senator Paul Douglas was reelected to a second term.
The 1960 United States Senate election in Illinois took place on November 8, 1960. Incumbent Democratic United States Senator Paul Douglas was reelected to a third term.
The 1970 United States Senate special election in Illinois was held on November 3, 1970, to fill the remainder of the term of Republican Everett Dirksen, who had died in office. Republican Ralph Tyler Smith had been appointed to fill the seat after Dirksen's death, and he lost the special election to Democrat Adlai Stevenson III. This election was the third consecutive time in which a United States Senate election in Illinois took place two years after a previous United States Senate election in Illinois after 1966 and 1968.
The 1974 United States Senate election in Illinois took place on November 5, 1974. Incumbent Democratic U.S. Senator Adlai Stevenson III, who was first elected in a special election in 1970, was re-elected to a full term in office, defeating Republican George Burditt by a landslide margin of nearly 800,000 votes (62%-37%).
The 1964 Illinois gubernatorial election was held in Illinois on November 3, 1964. The Democratic nominee, incumbent Governor Otto Kerner, Jr., won reelection against the Republican nominee, Charles H. Percy.
Elections were held in Illinois on Tuesday, November 7, 1972.
The Cook County, Illinois, general election was held on November 5, 1996.
The Cook County, Illinois, general election was held on November 3, 1992.
