Iowa’s 3rd congressional district remains one of the most competitive House races heading into the November 2026 midterms, with incumbent Republican Zach Nunn facing Democrat Sarah Trone Garriott. The seat’s narrow margins in recent cycles, combined with the typical midterm penalty for the president’s party, have shaped trader views reflected in current pricing. Post-primary polling has been mixed but shows the contest within a few points either way, while national forecasts classify the district as a toss-up or slight Democratic lean. Fundraising has been strong on both sides, with outside spending and early ad buys underway. Broader expectations of Democratic gains across the House map further support the market’s emphasis on the Democratic nominee in this swing district.
Experimentelle KI-generierte Zusammenfassung mit Polymarket-Daten. Dies ist keine Handelsberatung und spielt keine Rolle bei der Auflösung dieses Marktes. · AktualisiertIA-03 Wahlsieger
Demokratische Partei
77%
Republikanische Partei
21%
Demokratische Partei
77%
Republikanische Partei
21%
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/).
Markt eröffnet: Dec 16, 2025, 11:59 AM ET
Abwickler
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/).
Abwickler
0x2F5e3684c...Iowa’s 3rd congressional district remains one of the most competitive House races heading into the November 2026 midterms, with incumbent Republican Zach Nunn facing Democrat Sarah Trone Garriott. The seat’s narrow margins in recent cycles, combined with the typical midterm penalty for the president’s party, have shaped trader views reflected in current pricing. Post-primary polling has been mixed but shows the contest within a few points either way, while national forecasts classify the district as a toss-up or slight Democratic lean. Fundraising has been strong on both sides, with outside spending and early ad buys underway. Broader expectations of Democratic gains across the House map further support the market’s emphasis on the Democratic nominee in this swing district.
Experimentelle KI-generierte Zusammenfassung mit Polymarket-Daten. Dies ist keine Handelsberatung und spielt keine Rolle bei der Auflösung dieses Marktes. · Aktualisiert



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