Already crowded races for a pair of largely suburban Congressional seats got even more packed, and four representatives find themselves facing challenges within their own party, as candidate filing for the 2026 primary election wrapped up Monday.

New filings set up March 17 primary contests for Democratic Reps. Mike Quigley of the 5th District, Sean Casten of the 6th and Brad Schneider of the 10th.

Quigley is seeking his 10th full term representing the 5th District, which extends from Chicago through the Northwest suburbs and into southeastern Lake County. He faces a primary challenge from fellow Chicagoans Matthew Conroy, Ellen A. Corley and Jonny Antonio Bishop.

A three-way Republican primary in the 5th pits frequent candidate Tommy Hanson against Chicagoans Kimball Laiden and Bar

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