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Races · house · 2026 · Illinois
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house · open seat

Julie Fortier vs Mike Bost

← Illinois houseIllinois house →
Safe RR +33.9 forecast · 3 months 27 days to election· 0 polls · 2 marketsMarkets 11h agoRating today
Live model · win probabilityupdated 11h ago · poliagg-v34
1% Fortier (D)
99% Bost (R)
R+15R+5TIEDD+5D+15
Predicted final margin R +33.9 · 80% CI R+50.0 → R+17.8 · 3 months 27 days to election
Momentum
—
insufficient data
Tipping-point P
3.7%
Decisive for chamber control
Market · D-side
D 3¢
Cross-platform consensus
News articles · 30d
—
no recent coverage
Where this race stands
Verified

Safe R · model 99% R

No recent polls or markets for this race. PVI baseline (R+22) suggests Safe R.

The poliagg-v34 ensemble forecasts R+33.9 with an 80% CI ranging from R+50.0 (10th pctile) to R+17.8 (90th pctile), giving R a 99% chance of winning.

Tipping-point probability: 3.7% of simulations see this race as decisive for chamber control.

CITATIONS · safe-r · low-tipping
Forecast · poliagg-v34
Predicted final margin
R +33.9
80% CI: R +50.0 → R +17.8 · win prob 1%
R+60R+30TIEDD+30D+60
Quality · inputs
Data quality · medium
Polls used0
Days to election118
Residual σ12.56pt
Generated7/7/2026
▼ Compare with other models2 models
qgbt-v1GBT (qgbt)
R +45.7
80% CI R +61.1 → R +38.7
CV MAE 8.51
consensusMarket-implied
R +18.7
no interval
market-implied

Prediction markets

Consensus · D 3¢1 platformupdated 11h ago
Cross-platform price · history
0¢5¢10¢15¢54 DAYS · D YES PRICENOWMay 14Jul 7
Per-platform · current
PlatformD YESR YES7d ΔVolvs cons
Polymarket
“Will the Republican Party win the IL-12 House seat?”
3¢94¢+0¢—+0

Endorsements · 6 total

Source · Wikipedia · 0 candidates with no endorsements yet
3Fortier · 50%
Bost · 50%3
RMike Bost3 endorsers
Most notable · Donald Trump · 45th and 47th president of the United States (2017–2021, 2025–present)
Organizations2
Elected officials1
Federal 1State 0Local 0
DJulie Fortier3 endorsers
Most notable · AFL-CIO · s AFL-CIO
Organizations3

Money raised · own committees

FEC Schedule E (independent expenditures) + candidate-committee totals · last filing 2026-02-08
Mike BostOWN COMMITTEE
Receipts
$1.1M
Disburse
$753.4K
Cash on hand
$706.4K
Debts
$0
Top industries
No industry data.
Top contributors
No contributor data.
Julie FortierOWN COMMITTEE
Receipts
$40.8K
Disburse
$13.5K
Cash on hand
$27.3K
Debts
$0
Top industries
No industry data.
Top contributors
No contributor data.

Outside spending · independent expenditures

FEC Schedule E (independent expenditures) + candidate-committee totals · 24/48-hr IE reports
IE total
$53.9K
D side
$53.9K · 100%
R side
$0 · 0%
Top spender
—
For / against split
For Bores $53.9K

Editorial ratings · 4 raters

Cook · Sabato · Inside Elections · 538 · DDHQ et al.
Safe R4
Cook Political Report
Safe R
Jun 17
Inside Elections
Safe R
Jun 24
Sabato's Crystal Ball
Safe R
Jun 8
Split Ticket
Safe R
Jun 24

Demographic crosstabs

age · education · race · gender
No demographic crosstabs published for this race yet. Most pollsters release only topline numbers; subgroup breakdowns (age, education, race, gender) appear here when a pollster publishes them.
Rating timeline
May 5, 2026Safe Rmodel
May 3, 2026Lean Dmodel
Verification trail
Polls verified0 / 0deterministic
Polls flagged—none
Markets ingested1 platformupdated 11h ago
FEC filingssyncedcommittee + IE · 2026-02-08
Endorsements6 totalWikipedia scrape
News coverage< 5 articlesGoogle News
Method · bounds + percentage totals + date-order checks