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U.S. House · All Illinois races

Illinois District 14

Solid D
Compare
Lauren Underwood
Democratic · incumbent
>99 in 100
50–50chance of winning, out of 100
James Marter
Republican
<1 in 100

Lauren Underwood wins in >99 of 100 simulations.

There are no qualifying public polls yet, so the forecast leans on fundamentals; partisan lean, the national environment and incumbency point to Lauren Underwood +20.2.

Where the result could land

Every simulated outcome, grouped in 2-point steps. Projected margin Underwood +20.1; 80 in 100 fall between Underwood +12.9 and Underwood +27.4.

Marter +30Marter +20Marter +10Underwood +10Underwood +20Underwood +30Tie

The candidates

James Marter
Republican
No biography on file yet.
Lauren UnderwoodIncumbent
Democratic
No biography on file yet.

Ballot list and short bios from Wikipedia (CC BY-SA); websites from Wikidata.

What if this race flips? Try it in the map builder →

Polls

No public polls have tested Lauren Underwood against James Marter yet.

No polls of this matchup yet, so there is no polling average. The forecast relies on fundamentals.

Chance of winning over time

How this race’s odds have moved as polls and the national environment changed.

No change over the past 3 months
020406080100Aug 1Sep 1Oct 1

Out of 100. Today: Underwood 100, Marter 0.

What’s driving the forecast

The model blends each estimate by how much to trust it right now. Polls get 0% of the weight, 15 days out.

Polling average (after adjustments)—no polls
Partisan lean (Cook PVI, 2026 lines) D+3.0roughly 6 points of margin vs. the nation
National environment D+9.6generic ballot + presidential approval
Incumbent’s track record Underwood +0.9In 2024 they ran 1.8 pts more Democratic than the state’s lean predicted; half carries over (max 10)
IncumbencyUnderwood +3.6incumbent’s side
Fundamentals estimateUnderwood +20.2±6 typical error
Expert ratings (average)—used only in the “+ Expert ratings” version
ForecastUnderwood +20.2±5.7 standard deviation, including 2.3 for movement before Election Day

All three versions

  • Polls only: Lauren Underwood >99 in 100 (Solid D)
  • Polls + fundamentals: Lauren Underwood >99 in 100 (Solid D)
  • Polls + fundamentals + experts: Lauren Underwood >99 in 100 (Solid D)

Rules and notes

  • Incumbent renominated

House races, closest first · this is #169 of 421