Incumbent Rep. Lauren Underwood (D) advanced unopposed in the March 17, 2026, Illinois 14th District Democratic primary, setting up a general election rematch against James Marter (R), who won his primary decisively but lost to her 55%-45% in 2024. The district's D+3 Cook Partisan Voting Index, combined with Solid Democratic ratings from Cook Political Report and Sabato's Crystal Ball, plus Underwood's fundraising edge ($1.7 million raised versus Marter's $85,000 as of late February), underpin trader consensus at 91% for Democrats. A Republican upset would require a national midterm wave, Underwood scandal, legal challenges, or late health issues, though historical incumbent advantages in safe seats make shifts unlikely ahead of early voting starting September 24.
Experimental AI-generated summary referencing Polymarket data · UpdatedIL-14 House Election Winner
IL-14 House Election Winner
Democratic Party
91%
Republican Party
8%
Democratic Party
91%
Republican Party
8%
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/).
Market Opened: Jan 28, 2026, 11:09 AM ET
Resolver
0x2F5e3684c...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/).
Resolver
0x2F5e3684c...Incumbent Rep. Lauren Underwood (D) advanced unopposed in the March 17, 2026, Illinois 14th District Democratic primary, setting up a general election rematch against James Marter (R), who won his primary decisively but lost to her 55%-45% in 2024. The district's D+3 Cook Partisan Voting Index, combined with Solid Democratic ratings from Cook Political Report and Sabato's Crystal Ball, plus Underwood's fundraising edge ($1.7 million raised versus Marter's $85,000 as of late February), underpin trader consensus at 91% for Democrats. A Republican upset would require a national midterm wave, Underwood scandal, legal challenges, or late health issues, though historical incumbent advantages in safe seats make shifts unlikely ahead of early voting starting September 24.
Experimental AI-generated summary referencing Polymarket data · Updated
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