This week’s nominating contests could offer the first clues as to whether the political landscape has shifted.
Results will begin to display after polls close at 7 p.m.
What to watch for
Darren Bailey, a conservative farmer who earned Trump’s endorsement over the weekend and often reads from the Bible in campaign videos, is part of a six-candidate Republican field. His rivals include Richard Irvin, the first Black mayor of Illinois’ second-largest city, who had $50 million in support from billionaire Ken Griffin but was heavily targeted by Democrats who see Bailey as an easier matchup for J.B. Pritzker.
While Trump endorsed Bailey, he also campaigned alongside first-term Rep. Mary Miller, who is challenging five-term Rep. Rodney Davis in one of the state’s two incumbent-on-incumbent primaries.
But at Saturday’s rally, Miller described the Supreme Court’s reversal of Roe v. Wade as "a victory for white life." A spokesperson later said she had intended to say the decision was a victory for a "right to life."
But the Illinois congresswoman is no stranger to provocative statements. Soon after joining the House, Miller quoted Adolf Hitler, saying he was right to say that "whoever has the youth has the future."
Davis is a powerful, more moderate lawmaker who is the top Republican on the House Administration Committee, which deals with election legislation and the Capitol complex.
Meanwhile, two Democratic incumbents — Reps. Sean Casten and Marie Newman — are facing off for a Chicago-area seat. Also on the Democratic side, about two dozen candidates are fighting to succeed Rep. Bobby Rush, the only lawmaker to ever defeat Barack Obama. They include John Jackson, son of civil rights leader the Rev. Jesse Jackson, and Karin Norington-Reaves, who has Rush’s endorsement.