The retirement of incumbent Rep. Dan Newhouse in December 2025 opened Washington's 4th Congressional District, rated Solid Republican by Cook Political Report with an R+10 partisan voter index, driving trader consensus to an 82% implied probability for a GOP winner. Yakima County Commissioner Amanda McKinney, bolstered by President Trump's January endorsement, anchors the Republican primary field, while state Sen. Matt Boehnke's March announcement adds to a crowded GOP contest without altering the district's conservative dominance in central Washington agriculture country. Democrat John Duresky and independent Devin Pooré represent a thin opposition in this Trump-won battleground, ahead of the August 4 top-two primary; no recent polls have emerged to challenge the stable odds.
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
WA-04 House Election Winner
$23,963 Vol.
$23,963 Vol.
Republican Party
82%
Democratic Party
15%
$23,963 Vol.
$23,963 Vol.
Republican Party
82%
Democratic Party
15%
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...The retirement of incumbent Rep. Dan Newhouse in December 2025 opened Washington's 4th Congressional District, rated Solid Republican by Cook Political Report with an R+10 partisan voter index, driving trader consensus to an 82% implied probability for a GOP winner. Yakima County Commissioner Amanda McKinney, bolstered by President Trump's January endorsement, anchors the Republican primary field, while state Sen. Matt Boehnke's March announcement adds to a crowded GOP contest without altering the district's conservative dominance in central Washington agriculture country. Democrat John Duresky and independent Devin Pooré represent a thin opposition in this Trump-won battleground, ahead of the August 4 top-two primary; no recent polls have emerged to challenge the stable odds.
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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