[2] Turnout by county[2] Illinois voted for the Democratic ticket of Barack Obama and Joe Biden.

This was the sixth consecutive presidential election in which Illinois had voted for the Democratic ticket.

Illinois had lost one seat in the reapportionment following the 2010 United States Census.

All 18 of Illinois' remaining seats in the United States House of Representatives were up for election in 2012.

[4] The measure would have made it so that a three-fifths approval would be required by the General Assembly, city councils, and school districts that wish to increase the pension benefits of their employees.