Illinois 14

James Marter (R) vs Lauren Underwood (D).

Called by the AP: Lauren Underwood (D). Lauren Underwood (D) 64.1%; James Marter (R) 35.9%. Source: The Associated Press.

Cook: Solid D. 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: 0%.