Incumbent Rep. Dan Newhouse's December 2025 retirement opened Washington's 4th Congressional District—an R+10 seat per Cook PVI—for the 2026 cycle, yet trader consensus heavily favors a Republican winner at 80.5% implied probability, reflecting the district's consistent GOP dominance in Yakima, Tri-Cities, and central Washington. The May 8 filing deadline confirmed a crowded Republican primary field featuring state Sen. Matt Boehnke, Amanda McKinney, and four others against lone Democrat John Duresky, heightening odds that the August 4 top-two primary advances two GOP candidates to November's general election. Recent fundraising surges among Republicans and a candidate forum on May 9 underscore sustained party strength absent polling shifts.
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
$26,839 Vol.
$26,839 Vol.
Republican Party
81%
Democratic Party
20%
$26,839 Vol.
$26,839 Vol.
Republican Party
81%
Democratic Party
20%
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...Incumbent Rep. Dan Newhouse's December 2025 retirement opened Washington's 4th Congressional District—an R+10 seat per Cook PVI—for the 2026 cycle, yet trader consensus heavily favors a Republican winner at 80.5% implied probability, reflecting the district's consistent GOP dominance in Yakima, Tri-Cities, and central Washington. The May 8 filing deadline confirmed a crowded Republican primary field featuring state Sen. Matt Boehnke, Amanda McKinney, and four others against lone Democrat John Duresky, heightening odds that the August 4 top-two primary advances two GOP candidates to November's general election. Recent fundraising surges among Republicans and a candidate forum on May 9 underscore sustained party strength absent polling shifts.
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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