Political party strength in Illinois

Illinois is a Democratic stronghold in presidential elections and one of the "Big Three" Democratic strongholds alongside California and New York. It is one of the most Democratic states in the nation with all state executive offices and both state legislative branches held by Democrats.[1][2] For most of its history, Illinois was widely considered to be a swing state, voting for the winner of all but two presidential elections in the 20th century. Political party strength in Illinois is highly dependent upon Cook County, and the state's reputation as a blue state rests upon the fact that over 40% of its population and political power is concentrated in Chicago, Cook County, and the Chicago metropolitan area. Outside of Chicago, the suburban collar counties continue trending Democratic[3] while downstate Illinois can be considered more conservative with several Democratic leaning regions including Champaign-Urbana, Bloomington-Normal, Rockford, Peoria, the Quad Cities, and suburban St. Louis[4]

Illinois's electoral college votes have gone towards the Democratic presidential candidate for the past eight elections, and its congressional makeup tilts heavily Democratic with a 14-3 majority as of 2024. However, it has a history of competitive statewide elections and has elected a small number of moderate Republicans including Governors Jim Edgar, George Ryan, and Bruce Rauner, Senators Peter Fitzgerald and Mark Kirk, and other state executive officeholders including Judy Baar Topinka and Dan Rutherford.

The following table indicates the party of elected officials in the U.S. state of Illinois:

The table also indicates the historical party composition in the:

  1. ^ O'connor, John (14 January 2019). "Gov. Pritzker gives Democrats near-record power in Illinois". AP NEWS. Retrieved 15 January 2019.
  2. ^ "Illinois: The Most Democratic State". NBC Chicago. Retrieved 2021-06-21.
  3. ^ Baker, Suzanne. "How a blue wave rolled through historically Republican Naperville, leaving the GOP in its wake". chicagotribune.com. Retrieved 3 September 2021.
  4. ^ Smith, Katlyn (4 November 2020). "Democrats gain ground in once solidly red DuPage County". Daily Herald. Retrieved 9 November 2020.

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