Washington’s 4th congressional district remains a solidly Republican seat on the Cook Partisan Voter Index at R+10, with the open seat created by incumbent Dan Newhouse’s retirement drawing a crowded August 4 top-two primary field. Multiple Republican candidates, led in early fundraising by Yakima County Commissioner Amanda McKinney and including state Sen. Matt Boehnke and repeat contender Jerrod Sessler, compete alongside a single consolidated Democratic entrant, retired Air Force Maj. John Duresky. The district’s partisan lean and historical voting patterns underpin trader consensus favoring the Republican nominee advancing to and prevailing in the November general election, while the top-two format and primary dynamics introduce limited uncertainty around the exact matchup. No major new polling has shifted positioning in recent weeks.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedWA-04 House Election Winner
$29,950 Vol.
$29,950 Vol.
Republican Party
87%
Democratic Party
13%
$29,950 Vol.
$29,950 Vol.
Republican Party
87%
Democratic Party
13%
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, 11:24 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...Washington’s 4th congressional district remains a solidly Republican seat on the Cook Partisan Voter Index at R+10, with the open seat created by incumbent Dan Newhouse’s retirement drawing a crowded August 4 top-two primary field. Multiple Republican candidates, led in early fundraising by Yakima County Commissioner Amanda McKinney and including state Sen. Matt Boehnke and repeat contender Jerrod Sessler, compete alongside a single consolidated Democratic entrant, retired Air Force Maj. John Duresky. The district’s partisan lean and historical voting patterns underpin trader consensus favoring the Republican nominee advancing to and prevailing in the November general election, while the top-two format and primary dynamics introduce limited uncertainty around the exact matchup. No major new polling has shifted positioning in recent weeks.
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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