Illinois · Governor

How this state voted, 2024 +10.980 points

The state's presidential margin in 2024 as a share of all votes cast, from our own county sums — the same measurement the model's statewide terrain center is built from. Every pull below is measured from here, not from EVEN, which is why a landslide seat's listed pulls are small numbers and still land where the forecast does.

• 2024 presidential result for this state, as a share of all votes cast, from Call the Map's own county sums.
• Same source as Act I's 2024-president reference mark, so the origin lands on it.

Fitted model, above the terrain shown +11.314 points

What the fitted model adds on top of the starting terrain above — incumbency, past results, campaign finance and the other fitted terms — measured from that terrain rather than from EVEN. It is a comparison with the starting point already shown, not a separate input. The source detail lists the variables the fit uses.

• Fitted baseline 22.294 minus starting point 10.980 = 11.314 points.
• Fitted intercept: -6.136 points.
• 2010 White population share used by the frozen historical fit: observed input 71.411. -0.503 × ((71.411 − 77.922) / 12.864) = 0.254 points.
• gov_midterm_wh: observed input -1.000. -0.987 × ((-1.000 − 0.336) / 0.739) = 1.785 points.
• 2024 presidential lean relative to the national result: observed input 12.636. 4.163 × ((12.636 − -4.415) / 20.258) = 3.504 points.
• Previous governor election margin: observed input 12.540. 1.755 × ((12.540 − -3.131) / 19.227) = 1.431 points.
• gov_inc_running_signed: observed input 1.000. 2.531 × ((1.000 − -0.120) / 0.708) = 4.001 points.
• gov_inc_tenure_signed: observed input 2.000. 3.340 × ((2.000 − -0.143) / 0.902) = 7.934 points.
• The displayed arithmetic is rounded; the fitted terms use full precision. The intercept plus these five terms gives the non-ratings baseline.
• No source-verified current Gallup reading supports the former 40% / July 2026 claim. The current Gallup series ends in 2025; the Presidency Project identifies its 2026 observations as other pollsters. Use the unchanged fitted missing-value rule, not a replacement polling scale.
• Certified 2024 presidential baseline: state D+11.1, national R+1.5; subtracting the national margin gives relative lean +12.6. Source: FEC compilation of certified state results.

Historical error calibration +3.416 points

A prior-election residual correction, when an admitted model publishes one.

• The forecast’s calibration against past governor results. The recorded contribution is +3.4.

National environment +1.832 points

The contribution to this race’s margin, not the national polling margin itself. The race’s loading, reference level and polling blend determine how much of the national climate reaches its final forecast.

• The national environment in this edition is D+8.4. This row is its contribution to the race’s prior, not a claim that the country is D+1.8.
• This step’s recorded contribution to the margin is +1.8.
• The elasticity is fitted on the pooled panel of contested governor races (2010–2024) with cycle-clustered standard errors; it is a measured response to the national environment, not a judgment floor.

Structural safeguards +0.836 points

Bounded corrections that keep the model consistent with structural facts.

• The forecast’s fitted center calibration for governor races, measured on past cycles. The recorded contribution is +0.8.

This race’s polls −7.789 points

What this race’s own recent polling adds beyond its prior. The forecast weights each poll for recency and sample size and counts each pollster once; the weights listed here are those of the polls’ own average.

• ActiVote (2026-10-22, n=400): D+17.4 · weight 0.51 in the poll average
• Public Policy Polling (2026-10-01, n=569): D+20.0 · weight 0.48 in the poll average
• Victory Research (2025-11-24, n=1,200): D+20.3 · weight 0.02 in the poll average
• Poll average D+18.7, from 3 polls · 3 recorded polls. This is the polls’ own average, each poll at its published margin, the figure this page’s poll summary shows. In governor races the forecast then counts a poll sponsored by a party or campaign at full weight and moves its margin 2 points against that party, which leaves the average it reads the same for this race. It then applies a fitted correction of 2.5 points toward Republicans for governor races, measured from past polling error, before blending it with its other evidence. The forecast gives the polls 98% of the weight against its structural prior for this race, which moves the margin 7.8 points toward Republicans from where it stood before the polls. Eligible polls: latest poll: 2026-10-22 (6 days old).

Votes for other candidates −0.477 points

Every step above is measured between the two major-party candidates alone, as if nobody else were on the ballot. The forecast sets 2.3% of the vote aside for other candidates and write-ins, so as a share of every vote cast the gap between the two is smaller by that much. This step is exactly that: the two-party margin times the share going to other candidates. It is the same arithmetic that turns the two-party margin into the two shares printed at the top of the page.