Darren Bailey, left, and U.S. Rep. Mike Bost (R-Ill.), right, are competing in the 12th Congressional District Republican primary in 2024.

Both U.S. Reps. Mike Bost, a Murphysboro Republican, and Danny Davis, a Chicago Democrat, are facing formidable primary challenges in 2024 from within their own parties. Fundraising numbers released Saturday show Bost is financially fending off his opponent better than Davis.