IL-12 House 2026 · Hidden Levers

Race header

U.S. House, Illinois District 12 · Incumbent running

DEMNominee

Julie Fortier

1%Hume Outlook · Hume model estimate · as of 2026-10-28

REPNominee

Mike Bost incumbent

99%Hume Outlook · Hume model estimate · as of 2026-10-28

IncumbentMike Bost

Hume Outlook

hume-2026.10-r1 · Forecast as of Oct 28, 2026

99% Mike Bost · RepublicanChance to win, between the two named candidates

REP Mike Bost 99%

DEM Julie Fortier 1%

Hume model estimate · built on polls, fundamentals, and markets

Latest poll Not available No public polls of this race in our data yet.

Seat lean (Hume PVI) R+24 as of cycle 2020

Prior result, this seat REP 74.2% 2024 general · margin 48.4%

Side by side

2 candidates · 5 measures

FEC summary through 2026-10-14

MeasureDEMFortierREPBost

Total receiptsUSD, cycle to date, all authorized committees

Julie Fortier$159,060.74

Mike Bost$1,617,352.95

Total disbursementsUSD, cycle to date

Julie Fortier$125,311.39

Mike Bost$1,124,840.20

Cash on handUSD, close of the covered period

Julie Fortier$33,749.35

Mike Bost$844,808.76

Latest pollpercent, as stored

Julie FortierNot available No public polls of this race in our data yet.

Mike BostNot available No public polls of this race in our data yet.

Seat lean (Hume PVI)identical for every candidate

Julie FortierR+24seat-level

Mike BostR+24seat-level

Money is each candidate's FEC summary: every committee the candidate has authorized, combined, as filed through the coverage date shown.

Polling

0 listed · newest first

Not available No public polls of this race in our data yet.

Seat lean · Hume PVI

as of cycle 2020

R+24

Lean (D minus R, points): -23.831

Hume PVI is Hidden Levers' own two-party presidential-lean index for the district, computed on the district's current lines, not the Cook PVI.

Prior result, this seat

election returns

2024 general

Candidate	Party	Votes	% of total
Mike Bost	REP	272,754	74.19%
Brian Roberts	DEM	94,875	25.81%

Total votes 367,629 · winning margin 48.39% of total (margin computed here from the cited vote counts)

Sources: FEC filings (through Oct 14, 2026) · Prior result: MIT Election Data + Science Lab (CC0) · Hume PVI and Hume Outlook: Hidden Levers estimates.

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