Candidate filing for Illinois' March 17 primaries closed on Monday, and you can find a complete list of candidates here. At least one Democrat and one Republican filed in every district except IL-08, where Democratic Rep. Raja Krishnamoorthi is running unopposed. However, challenges to nominating petitions are frequent in Illinois, and candidates are often knocked off the ballot, so expect some changes.
IL-03: Running down the key races by district has us starting with Illinois' 3rd District, a solidly blue seat in southwestern Chicago where conservative Democratic Rep. Dan Lipinski once again faces a challenge from businesswoman Marie Newman. Newman held Lipinski to a narrow 51-49 win in last year's primary, but complicating matters for her this time is the presence of two other candidates: activist Rush Darwish and mechanic Charles Hughes. Hughes has been thrown off the ballot twice in prior bids for local office and hasn't even filed with the FEC, but Darwish has raised $345,000. It only takes a simple plurality to win, so Lipinski could benefit if there's a split in the anti-incumbent vote.
IL-06: The NRCC was dealt a heavy blow when its touted recruit, former Lt. Gov. Evelyn Sanguinetti, dropped out of the race to challenge freshman Democratic Rep. Sean Casten in October, leaving the GOP with former state Rep. Jeanne Ives as its only notable candidate in Illinois' 6th District. Ives is a conservative extremist who's a poor fit for this affluent and highly educated district in the western Chicago suburbs (check out this racist and transphobic ad she ran during her unsuccessful campaign for governor last year).
Hillary Clinton won this district 50-43 in 2016, though according to one analysis, former Republican Gov. Bruce Rauner carried it 50-45 last year despite getting blown out statewide.