Incumbent Dan Newhouse’s retirement opened Washington’s 4th congressional district for the November 2026 general election. The August 4, 2026 top-two primary produced a matchup between Republican Yakima County Commissioner Amanda McKinney and Democrat John Duresky. McKinney’s plurality consolidated Republican support across multiple GOP candidates, while the district’s voter registration patterns and consistent historical results continue to limit Democratic performance. Nonpartisan ratings classify the seat as safe or solid Republican, aligning with trader consensus that assigns the Republican nominee an overwhelming implied probability ahead of the general election.
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
$50,609 Vol.
$50,609 Vol.
Republican Party
91%
Democratic Party
8%
$50,609 Vol.
$50,609 Vol.
Republican Party
91%
Democratic 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, 11:24 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 Dan Newhouse’s retirement opened Washington’s 4th congressional district for the November 2026 general election. The August 4, 2026 top-two primary produced a matchup between Republican Yakima County Commissioner Amanda McKinney and Democrat John Duresky. McKinney’s plurality consolidated Republican support across multiple GOP candidates, while the district’s voter registration patterns and consistent historical results continue to limit Democratic performance. Nonpartisan ratings classify the seat as safe or solid Republican, aligning with trader consensus that assigns the Republican nominee an overwhelming implied probability ahead of the general election.
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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