Illinois 12

Mike Bost (R) vs Julie Fortier (D).

Called by the AP: Mike Bost (R). Mike Bost (R) 70.1%; Julie Fortier (D) 29.9%. Source: The Associated Press.

Cook: Solid R. Public polls: 0.

Atlas pre-election model — built only from data frozen on October 29, 2026; first published November 3 after polls closed, so it is a test of the method, not a prediction. Republican chance in that model: 100%.