IL-11 House winner?
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AI Analysis
Trader mode: Actionable analysis for identifying opportunities and edge
About This Event
IL-11 If the House member sworn in for IL-11 for the term beginning in 2027 is a member X 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.
Current Market Outlook
The market is pricing a Democratic win in Illinois' 11th Congressional District at 95%. That is not a contested race. That is a foregone conclusion. Kalshi traders are treating this as nearly certain, and for good reason. The district covers western Chicago suburbs including Naperville, Aurora, and Joliet, and has a Cook Partisan Voting Index of D+5.
Key Factors Driving the Odds
The incumbent is Rep. Bill Foster, a Democrat who has held the seat since 2013. Foster won his 2024 primary with 74% of the vote and faces only token Republican opposition in the general election. The district has not elected a Republican since 2008, when it was a different configuration.
Demographic shifts explain the lopsided odds. The 2020 redistricting made IL-11 more Democratic by adding parts of Aurora and losing Republican-leaning rural areas. In 2022, Foster won by 14 points. In 2024, he won by 11 points. The district's Democratic performance in presidential races has been even stronger: Biden won it by 16 points in 2020.
The 95% probability reflects a simple reality: this is a safe Democratic seat in a state where Democrats control redistricting and the Republican Party has largely ceded the Chicago suburbs. No credible analyst rates this race as competitive. Cook Political Report and Sabato's Crystal Ball both list it as "Solid Democratic."
What Could Change These Odds
The only scenario where Republicans win is a national political tsunami that breaks historical voting patterns. A 2026 midterm wave comparable to 2010 (when Democrats lost 63 seats) could theoretically flip IL-11, but that would require a Republican margin of 10-12 points nationally. Current generic ballot polling shows no such wave building.
Foster is 73 and could retire, but he has given no indication of stepping down. An open seat primary could produce a more moderate Democratic nominee, but the district's fundamentals would remain unchanged. The 5% chance priced in by the market is essentially a hedge against catastrophic Democratic performance or a major scandal. Neither is priced as likely.
AI-generated analysis based on market data. Not financial advice.
Overview
Illinois's 11th congressional district is a U.S. House seat in the northeastern part of the state, covering parts of Cook, DuPage, and Will counties. The district includes suburbs southwest of Chicago such as Naperville, Bolingbrook, and parts of Aurora. It was created after the 2010 census and has been represented by Democrat Bill Foster since 2013. The IL-11 house winner prediction market asks which party will win the seat in the 2026 election for the term beginning in 2027. The district has been competitive in recent cycles. In 2022, Foster won reelection with 56.4% of the vote against Republican Catalina Lauf. In 2024, Foster faced Republican Jerry Evans and won with 54.2%. The district's partisanship is moderate. The Cook Partisan Voting Index rates IL-11 as D+5, meaning it leans Democratic by 5 points compared to the national average. However, the district has trended slightly more Republican in recent presidential elections. Donald Trump won 44% of the vote in 2020 and 42% in 2016. The 2026 election will be shaped by the national political environment, candidate quality, and the possibility of redistricting. Illinois lost a congressional seat after the 2020 census, and the state map was redrawn in 2021. Further changes could occur before 2026. The race is seen as a potential pickup opportunity for Republicans if the national environment is favorable. The market is eligible for early resolution after a consensus of media organizations projects the winner.
Historical Context
Illinois's 11th district was created after the 2010 census when the state lost a seat. The first representative was Republican Adam Kinzinger, who served from 2013 to 2019. Kinzinger was a moderate Republican who later became a critic of Donald Trump. He did not seek reelection in 2022. After the 2020 census, Illinois lost another seat, reducing its delegation from 18 to 17. The Democratic-controlled state legislature drew a map that protected incumbents. The new IL-11 map added Democratic-leaning areas like Aurora and removed some Republican suburbs. Bill Foster has represented the district since 2013. He won his first election in the district by 10.5 points in 2012. His margins have varied. In 2016, he won by 16.4 points. In 2018, by 20.2 points. In 2020, by 8.7 points. In 2022, by 12.8 points. In 2024, by 8.4 points. The shrinking margin in 2024 suggests the district is becoming more competitive. The 2026 election will be the first midterm under the next president. Historically, the president's party loses House seats in midterms. Since 1934, the average loss is 26 seats. If a Republican wins the White House in 2024, IL-11 could be more vulnerable for Foster.
Why It Matters
The IL-11 race is one of a handful of competitive House seats in Illinois. Control of the U.S. House is determined by races like this. In 2024, Republicans held a narrow majority. A shift of a few seats could flip control. The outcome affects legislation on taxes, healthcare, and immigration. The race also tests the strength of suburban moderates. IL-11 is a suburban district that has trended Democratic since 2016. But rising inflation and crime could push voters back to Republicans. The result will signal which party's message resonates in the suburbs. For Illinois, the race determines the state's influence in Congress. A Democratic incumbent adds to the state's delegation power. A Republican win would give Illinois a rare GOP seat. The race also affects the state's political dynamics. A Foster loss could embolden Republicans in other races. It could also lead to a more aggressive state legislative map in 2030.
Current Status
As of early 2025, Bill Foster is the incumbent. He has not announced whether he will run for reelection in 2026. If he retires, the seat becomes an open race, which is more competitive. The 2026 election is two years away. The national political environment is uncertain. The 2024 presidential election result will shape the race. If a Republican wins the White House, the 2026 midterm could favor Democrats. If a Democrat wins, Republicans may target IL-11 more aggressively. Candidate recruitment is ongoing. Potential Republican candidates include Jerry Evans, who ran in 2024, and Catalina Lauf, who ran in 2022. Other names may emerge. Redistricting is not expected before 2030, but court challenges could alter the map. The current map is likely to remain in place.
Frequently Asked Questions
Who is the current representative for Illinois's 11th district?
The current representative is Democrat Bill Foster. He has held the seat since 2013 and was reelected in 2024 with 54.2% of the vote.
Is Illinois's 11th district a safe Democratic seat?
No, it is a lean Democratic seat. The Cook PVI is D+5, and Foster's margin has shrunk from 12.8 points in 2022 to 8.4 points in 2024. It could flip in a strong Republican year.
What counties are in Illinois's 11th congressional district?
The district includes parts of Cook, DuPage, and Will counties. Major communities include Naperville, Bolingbrook, Aurora, and parts of Joliet.
Will Bill Foster run for reelection in 2026?
Foster has not announced his plans. He is 69 years old. If he retires, the open seat would be more competitive and attract a larger field of candidates.
How has redistricting affected Illinois's 11th district?
After the 2020 census, Illinois lost a seat. The Democratic-controlled legislature drew a map that shifted IL-11 slightly to the left by adding parts of Aurora and removing some Republican areas.
What are the key issues in IL-11 elections?
Key issues include inflation, crime, education, abortion rights, and immigration. The district's suburban voters tend to prioritize economic concerns and school quality.
Educational content is AI-generated and sourced from Wikipedia. It should not be considered financial advice.
