2024Final results
2024 election for Illinois's 12th District
U.S. House · Illinois
Mike Bost (R) won with 74.2% of the vote, defeating Brian Roberts (D) by 48.4 points.
Mike BostRepublican · winner
74.2%272,754
Brian RobertsDemocrat
25.8%94,875
The same year, the district voted R+42.9 for president; this race was R+48.4.367,629 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 3:26 AM ET
The seat over time
D − R margin in this seat's races around 2024
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 3:26 AM ET
Money in this race
Each line compares the two campaigns on one scale.
No DemocratMike Bost
—
Raised by the campaign
$3.2M
—
Spent by the campaign
$3.2M
—
Cash on hand
$352.3K
Campaign money: FEC, through Dec 31, 2024.
Source: FEC campaign filingsUpdated Dec 31, 2024