2026 forecast · Illinois 4th

Patty Garcia is all but certain to win Illinois's 4th District.

Patty Garcia vs Lupe Castillo, an open seat. The model has Garcia ahead by 53.4 points, winning 100 percent of 2,000 simulated elections.

Safe DModel D +53.4Updated October 22, 2026
Patty Garcia
Democrat
75.6%
200,089 projected votes
Lupe Castillo
Republican
22.2%
58,671 projected votes
100%Garcia
0%Castillo
Garcia all but certainEach square is one simulated election night, Garcia wins about 100 of 100
RatingSafe D100% chance for Garcia
Model marginD +53.4No polls in the race
80 percent rangeD +59.4 to D +46.82,000 simulations
Projected votes264,615Garcia 75.6%

The district map

Every district in the state, shaded by its rating

Illinois districts

17 districts
Safe DLikely DLean DToss upLean RLikely RSafe R

Vote share

Each candidate's projected share and the range of 80 percent of simulations

Patty GarciaDemocrat · 100% to win
75.6%
Lupe CastilloRepublican · 0% to win
22.2%

Scale runs from 25 to 75 percent. The dot is the forecast, the band is the 80 percent range and the brighter tick marks 50 percent.

Projected district vote

264,615 votes
CandidateVotesShare
Patty Garcia D200,08975.6%
Lupe Castillo R58,67122.2%
Ed Hershey I5,8552.2%
Total264,615100%

Each candidate's expected vote in the On Point simulation, at the forecast's projected turnout.

The trend

Each side's chance of winning over the forecast's recent updates

0%25%50%75%100%100% Garcia0% Castillo15 updates agoToday

Polling

Every poll in the average, and how the model reads it

The Illinois governor polling average
30%35%40%45%50%55%60%MayJunJulAugSepOct54.0Pritzker34.0Bailey
The line is the On Point average: a robust LOWESS fit through the polls, weighted by recency, sample, voter screen and pollster grade, refit three times so outliers count for lessDot size is each poll's weight todayHover or use the arrow keys to read any day
What moves the average today
Public Policy Polling for Chicago News WeeklyOct 1 · 569 LV · D->99%Pritzker +20.0

This is the same On Point polling average as the full average page. The forecast reads the polls through its own Election Day projection, shown as the On Point average in the table below, and blends it with partisan lean and fundamentals.

Polls of the race

Full average
PollsterSampleAgeMargin
On Point averageWeighted averageNo polls

Each margin is the poll as the pollster published it. The forecast counts every poll after its house effect and the undecided split, which is what the trail above shows; hover a margin for the counted value. Lean R and Lean D mark partisan leaning firms.

Model margin
Garcia +53.4
Chance of winning
Patty Garcia100%
Lupe Castillo0%
Simulated vote
Patty Garcia75.6%
Lupe Castillo22.2%
Ed Hershey2.2%
How the model gets there
Partisan leanR +28.0
FundamentalsD +53.3
With pollsD +53.2
Early vote turnoutD +0.3
With early voteD +53.4

Read from 0 ballots cast so far in Illinois, against the party mix the forecast expected of them, with similar states and primary turnout. Early vote tracker

How we got here

From the state's partisan lean to the forecast, one stage at a time

D +64R +64Partisan leanthe state's baselineR +28.0Fundamentalsapproval, economy, candidatesD +53.3With pollsno pollsD +53.2With early voteturnout so farD +53.4
Methodology
Every county is rebuilt by simulating voters going to the polls, 2,000 times, from On Point Polling survey data, past results, and the polling average. How the model works.