Washington’s 4th congressional district remains a solidly Republican seat with an R+10 partisan voter index and a 14.5-point Trump margin in 2024, setting baseline expectations for Republican nominee Amanda McKinney against Democrat John Duresky after the August 4 top-two primary. McKinney consolidated GOP support as the Trump-endorsed Yakima County commissioner while Duresky advanced as the unified Democratic choice, yet the open-seat dynamics and limited post-primary polling leave the exact victory margin uncertain across multiple buckets. Trader pricing reflects this through closely matched probabilities on Republican margins from single digits to the mid-30s alongside a Democrat-win option, underscoring how turnout in rural central Washington counties, national midterm conditions, and candidate-specific mobilization could shift the final spread without altering the favored outcome.
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 Margin of Victory
Republican 20-25% 44%
Republican 35%+ 42%
Republican 30-35% 42%
Republican 25-30% 42%

Republican 35%+
42%

Republican 30-35%
42%

Republican 25-30%
42%

Republican 20-25%
44%

Republican 15-20%
40%

Republican 10-15%
42%

Republican 5-10%
40%

Republican 0-5%
42%

Democrat Wins
41%
Republican 20-25% 44%
Republican 35%+ 42%
Republican 30-35% 42%
Republican 25-30% 42%

Republican 35%+
42%

Republican 30-35%
42%

Republican 25-30%
42%

Republican 20-25%
44%

Republican 15-20%
40%

Republican 10-15%
42%

Republican 5-10%
40%

Republican 0-5%
42%

Democrat Wins
41%
This market will resolve according to the margin of victory between the top two candidates in the specified election.
The "margin of victory" is defined as the absolute difference between the percentages of valid votes received by the first-place and second-place candidates. Percentages of the valid votes received by each candidate will be determined by dividing the total number of valid votes each of the top two candidates receives by the sum of all valid votes cast in the election.
The options for "Democrat" and "Republican" refer to any representative of the Democratic Party and Republican Party, respectively, appearing on the general election ballot.
If the reported value falls exactly between two brackets, then this market will resolve to the higher margin bracket.
If two or more candidates tie for the most valid votes in this election, and the tie is between two candidates listed, this market will resolve to the lowest margin bracket for the candidate whose ballot-listed last name comes first in alphabetical order. If the tie is between a listed candidate and an unlisted candidate, this market will resolve to the lowest margin bracket for the listed candidate. If the tie is between two or more unlisted candidates, this market will resolve to "Other." If the listed candidate is represented in this market group as "Republican" or "Democrat" their ballot-listed last name will still be used for tiebreaking.
This market will resolve based on the official vote count once the count has been made official.
If the election results are not known definitively by June 30, 2027, 11:59 PM ET, this market will resolve to "Other".
If a recount is initiated before the vote total has been made official, the market will remain open until the recount is completed and the vote is made official.
The primary resolution source for this market will be the official results of the 2026 WA-04 House election as published by the state electoral authority responsible for certifying the results of the election; however, an overwhelming consensus of credible reporting may also be used.
Market Opened: Sep 2, 2026, 4:14 PM ET
Resolver
0x69c47De9D...This market will resolve according to the margin of victory between the top two candidates in the specified election.
The "margin of victory" is defined as the absolute difference between the percentages of valid votes received by the first-place and second-place candidates. Percentages of the valid votes received by each candidate will be determined by dividing the total number of valid votes each of the top two candidates receives by the sum of all valid votes cast in the election.
The options for "Democrat" and "Republican" refer to any representative of the Democratic Party and Republican Party, respectively, appearing on the general election ballot.
If the reported value falls exactly between two brackets, then this market will resolve to the higher margin bracket.
If two or more candidates tie for the most valid votes in this election, and the tie is between two candidates listed, this market will resolve to the lowest margin bracket for the candidate whose ballot-listed last name comes first in alphabetical order. If the tie is between a listed candidate and an unlisted candidate, this market will resolve to the lowest margin bracket for the listed candidate. If the tie is between two or more unlisted candidates, this market will resolve to "Other." If the listed candidate is represented in this market group as "Republican" or "Democrat" their ballot-listed last name will still be used for tiebreaking.
This market will resolve based on the official vote count once the count has been made official.
If the election results are not known definitively by June 30, 2027, 11:59 PM ET, this market will resolve to "Other".
If a recount is initiated before the vote total has been made official, the market will remain open until the recount is completed and the vote is made official.
The primary resolution source for this market will be the official results of the 2026 WA-04 House election as published by the state electoral authority responsible for certifying the results of the election; however, an overwhelming consensus of credible reporting may also be used.
Resolver
0x69c47De9D...Washington’s 4th congressional district remains a solidly Republican seat with an R+10 partisan voter index and a 14.5-point Trump margin in 2024, setting baseline expectations for Republican nominee Amanda McKinney against Democrat John Duresky after the August 4 top-two primary. McKinney consolidated GOP support as the Trump-endorsed Yakima County commissioner while Duresky advanced as the unified Democratic choice, yet the open-seat dynamics and limited post-primary polling leave the exact victory margin uncertain across multiple buckets. Trader pricing reflects this through closely matched probabilities on Republican margins from single digits to the mid-30s alongside a Democrat-win option, underscoring how turnout in rural central Washington counties, national midterm conditions, and candidate-specific mobilization could shift the final spread without altering the favored outcome.
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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