The IL-04 race features an open seat after incumbent Jesús "Chuy" García’s retirement, with Democratic nominee Patty García facing Republican Lupe Castillo in the November 2026 general election. Traders see the contest as a safe Democratic hold given the district’s strong D+17 Cook PVI and consistent prior margins exceeding 40 points, yet the spread across Democrat victory buckets reflects uncertainty over the precise margin. Recent ballot rulings removing independent candidates have narrowed the field without shifting the underlying partisan balance. Fundraising reports, primary turnout patterns, and limited opposition activity keep the race contained, while upcoming fall polling or late campaign developments could clarify whether the outcome lands in the 30-40% or 40-50% range.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedDemocrat 45-50% 37%
Democrat 35-40% 37%
Republican Wins 37%
Democrat 55%+ 37%

Democrat 55%+
37%

Democrat 50-55%
37%

Democrat 45-50%
37%

Democrat 40-45%
37%

Democrat 35-40%
37%

Democrat 30-35%
37%

Democrat 25-30%
37%

Democrat 15-25%
37%

Democrat 0-15%
37%

Republican Wins
37%
Democrat 45-50% 37%
Democrat 35-40% 37%
Republican Wins 37%
Democrat 55%+ 37%

Democrat 55%+
37%

Democrat 50-55%
37%

Democrat 45-50%
37%

Democrat 40-45%
37%

Democrat 35-40%
37%

Democrat 30-35%
37%

Democrat 25-30%
37%

Democrat 15-25%
37%

Democrat 0-15%
37%

Republican Wins
37%
This market will resolve according to the margin of victory between the top two candidates in the specified election.
The "margin of victory" is defined as the absolute difference between the percentages of valid votes received by the first-place and second-place candidates. Percentages of the valid votes received by each candidate will be determined by dividing the total number of valid votes each of the top two candidates receives by the sum of all valid votes cast in the election.
For purposes of this market, candidates nominated by the Democratic & Republican Parties will represent the options for "Democrat" and "Republican," respectively. Independent candidates will not represent options for either party. The candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of the party.
If the reported value falls exactly between two brackets, then this market will resolve to the higher margin bracket.
If two or more candidates tie for the most valid votes in this election, and the tie is between two candidates listed, this market will resolve to the lowest margin bracket for the candidate whose ballot-listed last name comes first in alphabetical order. If the tie is between a listed candidate and an unlisted candidate, this market will resolve to the lowest margin bracket for the listed candidate. If the tie is between two or more unlisted candidates, this market will resolve to "Other." If the listed candidate is represented in this market group as "Republican" or "Democrat" their ballot-listed last name will still be used for tiebreaking.
This market will resolve based on the official vote count once the count has been made official.
If the election results are not known definitively by June 30, 2027, 11:59 PM ET, this market will resolve to "Other".
If a recount is initiated before the vote total has been made official, the market will remain open until the recount is completed and the vote is made official.
The primary resolution source for this market will be the official results of the 2026 IL-04 House election as published by the state electoral authority responsible for certifying the results of the election; however, an overwhelming consensus of credible reporting may also be used.
Market Opened: Aug 10, 2026, 10:52 AM ET
Resolver
0x69c47De9D...This market will resolve according to the margin of victory between the top two candidates in the specified election.
The "margin of victory" is defined as the absolute difference between the percentages of valid votes received by the first-place and second-place candidates. Percentages of the valid votes received by each candidate will be determined by dividing the total number of valid votes each of the top two candidates receives by the sum of all valid votes cast in the election.
For purposes of this market, candidates nominated by the Democratic & Republican Parties will represent the options for "Democrat" and "Republican," respectively. Independent candidates will not represent options for either party. The candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of the party.
If the reported value falls exactly between two brackets, then this market will resolve to the higher margin bracket.
If two or more candidates tie for the most valid votes in this election, and the tie is between two candidates listed, this market will resolve to the lowest margin bracket for the candidate whose ballot-listed last name comes first in alphabetical order. If the tie is between a listed candidate and an unlisted candidate, this market will resolve to the lowest margin bracket for the listed candidate. If the tie is between two or more unlisted candidates, this market will resolve to "Other." If the listed candidate is represented in this market group as "Republican" or "Democrat" their ballot-listed last name will still be used for tiebreaking.
This market will resolve based on the official vote count once the count has been made official.
If the election results are not known definitively by June 30, 2027, 11:59 PM ET, this market will resolve to "Other".
If a recount is initiated before the vote total has been made official, the market will remain open until the recount is completed and the vote is made official.
The primary resolution source for this market will be the official results of the 2026 IL-04 House election as published by the state electoral authority responsible for certifying the results of the election; however, an overwhelming consensus of credible reporting may also be used.
Resolver
0x69c47De9D...The IL-04 race features an open seat after incumbent Jesús "Chuy" García’s retirement, with Democratic nominee Patty García facing Republican Lupe Castillo in the November 2026 general election. Traders see the contest as a safe Democratic hold given the district’s strong D+17 Cook PVI and consistent prior margins exceeding 40 points, yet the spread across Democrat victory buckets reflects uncertainty over the precise margin. Recent ballot rulings removing independent candidates have narrowed the field without shifting the underlying partisan balance. Fundraising reports, primary turnout patterns, and limited opposition activity keep the race contained, while upcoming fall polling or late campaign developments could clarify whether the outcome lands in the 30-40% or 40-50% range.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
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