Updated Oct 16, 2026, 1:45 PM ET
House · 3 November 2026

IL-14 House 2026

96.1% DLauren Underwood leads TruthIndex™Safe D
Polymarket
96.0%
Kalshi
96.8%
Spread
0.8 pts
24h
–
7 days
−1.2
Updated
Oct 16, 2026, 1:45 PM ET
Latest coverage

Live News

Recent coverage for IL-14 House.

Lauren Underwood, last 60 days

How to read this chart

The green line is the TruthIndex™, the chance of this outcome. It combines the prices on both venues and gives more weight to the venue with more money in its order book. The two thinner lines are Polymarket's and Kalshi's own prices, and the grey band between them shows how far apart the two venues are.

The pale bands behind the lines are the rating zones (Toss-up, Lean, Likely and Safe), so you can see when the race moved from one rating to another. Move along the chart, or use the arrow keys, to read the values for each day.

More in Methodology
TruthIndex™PolymarketKalshiGap between the venuesRating zones

All outcomes

OutcomeTruthIndex™PolymarketKalshiSpread24h
DLauren Underwood 96.1% 96.0% 96.8% 0.8 pts –
RJames Marter 2.6% 2.5% 2.7% 0.2 pts –

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Candidates & Background

James Marter

Republican Member of the Oswego Public Library Board

James Marter, a Republican Oswego Public Library Board member and perennial candidate, is the Republican nominee for Illinois's 14th congressional district in 2026 against Democratic incumbent Lauren Underwood.

Lauren Underwood

Lauren Underwood

Democratic U.S. Representative for Illinois's 14th congressional district (since 2019)

Lauren Underwood, a Democrat and registered nurse who has represented Illinois's 14th congressional district since 2019, seeks re-election in 2026 against Republican James Marter, an Oswego Public Library Board member.

Born 1986 · Mayfield Heights, Ohio

Margin of victory

Each venue's margin market, shown on its own: the two venues set their ranges differently.

Kalshi3.3K contracts

Illinois's 14th District margin of victory

Underwood, 5+ pts
92.0%
Underwood, 8+ pts
84.5%
Underwood, 11+ pts
75.0%
Underwood, 14+ pts
63.0%
Underwood, 17+ pts
55.0%
Underwood, 20+ pts
44.0%
Underwood, 23+ pts
33.0%
Underwood, 26+ pts
22.0%
Underwood, 29+ pts
11.8%
Source: Kalshi market

Polymarket$14.5K traded

IL-14 House Election Margin of Victory

Republican Wins
0.2%
implied
Democrat 0-5%
0.1%
Democrat 5-10%
3.8%
Democrat 10-15%
11.7%
Democrat 15-20%
15.5%
Democrat 20-25%
22.5%
Democrat 25-30%
32.0%
Democrat 30-35%
8.4%
Democrat 35%+
9.3%
Source: Polymarket market

Each venue's market

Polymarket$25.6K traded

Prices which party wins.

Lauren Underwood: Counted · bid 94.8% / ask 97.2% · $5.1K within 5 pts

This market will resolve according to the party of the candidate who wins the IL-14 congressional district seat in the U.S. House of Representatives in the 2026 midterm elections. The midterm elections will take place on November 3, 2026. ​A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time all of the 2026 House elections are conclusively called by this market's resolution sources. A candidate without a ballot-listed affiliation to either the Democrat or Republican parties will be considered a member of one of these parties based on the party with which they most recently expressed their intent to caucus at the time all of the House elections are conclusively called by this market's resolution sources. This market will resolve based on the result of the election as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the United States government, specifically the Federal Election Commission (https://www.fec.gov/).

Full rules on Polymarket

Kalshi3.3K contracts traded

Prices which party wins.

Lauren Underwood: Counted · bid 94.8% / ask 98.9% · $890 within 5 pts

Contract shown: Lauren Underwood

If the House member sworn in for IL-14 for the term beginning in 2027 is a member of the Democratic Party, then the market resolves to Yes.

This market is eligible for accelerated determination after a consensus of media organizations project the winner. See full rules for details.

Full rules on Kalshi