Two confirmed primary defeats for Republican Senate incumbents—Bill Cassidy in Louisiana and John Cornyn in Texas, both to Trump-endorsed challengers—have established a baseline of two losses, the first such pair since 2010. These outcomes, driven by shifts toward aligned candidates in competitive GOP fields, anchor trader expectations around a third defeat. Limited additional Senate primary contests remain, with few other incumbents facing serious opposition, supporting the 82% consensus on exactly three total losses. Factors that could alter this include any late-cycle upsets or retirements converting to primary challenges before remaining filing deadlines close.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated3 82.0%
4 10.3%
2 7.8%
>4 4.3%
$54,320 Vol.
$54,320 Vol.
0
<1%
1
<1%
2
8%
3
82%
4
10%
>4
4%
3 82.0%
4 10.3%
2 7.8%
>4 4.3%
$54,320 Vol.
$54,320 Vol.
0
$4,201 Vol.
<1%
1
$3,323 Vol.
<1%
2
$30,706 Vol.
8%
3
$7,548 Vol.
82%
4
$4,541 Vol.
10%
>4
$4,000 Vol.
4%
The 2026 midterm elections are scheduled to be held on November 3, 2026, with congressional primaries running from March through September.
This market will resolve according to the number of Republican Senate incumbents who do not win their nominating election to move on to the general election as a result of the 2026 midterm primary elections.
An incumbent will be considered not to have won their election if they are not declared the winner of the election they sought, including if they withdraw, suspend, or otherwise leave the race at any point after officially registering as a candidate, regardless of the reason. Incumbents who do not officially register as candidates for reelection will not be considered.
This market will resolve based on the results of all Senate nominating elections, including party primaries, top-two or jungle primaries, and primaries for special elections, that are scheduled to occur between March 1 and September 30, 2026. If a required runoff for any such election or a subsequent qualifying round in a non-partisan primary system could change the market’s outcome, the market will remain open until that contest is conclusively called by this market’s resolution sources.
A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time of their nominating election. A candidate without a ballot-listed affiliation to either the Democratic 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 prior to the conclusion of the relevant nominating election.
The resolution source for this market will be the Associated Press, Fox News, and NBC. This market will resolve once all three sources have conclusively called all relevant nominating elections. If all three sources do not achieve consensus in calling the relevant races for this market, it will resolve based on official state certification of the nominating election results.Two confirmed primary defeats for Republican Senate incumbents—Bill Cassidy in Louisiana and John Cornyn in Texas, both to Trump-endorsed challengers—have established a baseline of two losses, the first such pair since 2010. These outcomes, driven by shifts toward aligned candidates in competitive GOP fields, anchor trader expectations around a third defeat. Limited additional Senate primary contests remain, with few other incumbents facing serious opposition, supporting the 82% consensus on exactly three total losses. Factors that could alter this include any late-cycle upsets or retirements converting to primary challenges before remaining filing deadlines close.
The 2026 midterm elections are scheduled to be held on November 3, 2026, with congressional primaries running from March through September.
This market will resolve according to the number of Republican Senate incumbents who do not win their nominating election to move on to the general election as a result of the 2026 midterm primary elections.
An incumbent will be considered not to have won their election if they are not declared the winner of the election they sought, including if they withdraw, suspend, or otherwise leave the race at any point after officially registering as a candidate, regardless of the reason. Incumbents who do not officially register as candidates for reelection will not be considered.
This market will resolve based on the results of all Senate nominating elections, including party primaries, top-two or jungle primaries, and primaries for special elections, that are scheduled to occur between March 1 and September 30, 2026. If a required runoff for any such election or a subsequent qualifying round in a non-partisan primary system could change the market’s outcome, the market will remain open until that contest is conclusively called by this market’s resolution sources.
A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time of their nominating election. A candidate without a ballot-listed affiliation to either the Democratic 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 prior to the conclusion of the relevant nominating election.
The resolution source for this market will be the Associated Press, Fox News, and NBC. This market will resolve once all three sources have conclusively called all relevant nominating elections. If all three sources do not achieve consensus in calling the relevant races for this market, it will resolve based on official state certification of the nominating election results.
This market will resolve according to the number of Republican Senate incumbents who do not win their nominating election to move on to the general election as a result of the 2026 midterm primary elections.
An incumbent will be considered not to have won their election if they are not declared the winner of the election they sought, including if they withdraw, suspend, or otherwise leave the race at any point after officially registering as a candidate, regardless of the reason. Incumbents who do not officially register as candidates for reelection will not be considered.
This market will resolve based on the results of all Senate nominating elections, including party primaries, top-two or jungle primaries, and primaries for special elections, that are scheduled to occur between March 1 and September 30, 2026. If a required runoff for any such election or a subsequent qualifying round in a non-partisan primary system could change the market’s outcome, the market will remain open until that contest is conclusively called by this market’s resolution sources.
A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time of their nominating election. A candidate without a ballot-listed affiliation to either the Democratic 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 prior to the conclusion of the relevant nominating election.
The resolution source for this market will be the Associated Press, Fox News, and NBC. This market will resolve once all three sources have conclusively called all relevant nominating elections. If all three sources do not achieve consensus in calling the relevant races for this market, it will resolve based on official state certification of the nominating election results.
Market Opened: Jan 14, 2026, 2:51 PM ET
Volume
$54,320Market Opened
Jan 14, 2026, 2:51 PM ETResolver
0x2F5e3684c...The 2026 midterm elections are scheduled to be held on November 3, 2026, with congressional primaries running from March through September.
This market will resolve according to the number of Republican Senate incumbents who do not win their nominating election to move on to the general election as a result of the 2026 midterm primary elections.
An incumbent will be considered not to have won their election if they are not declared the winner of the election they sought, including if they withdraw, suspend, or otherwise leave the race at any point after officially registering as a candidate, regardless of the reason. Incumbents who do not officially register as candidates for reelection will not be considered.
This market will resolve based on the results of all Senate nominating elections, including party primaries, top-two or jungle primaries, and primaries for special elections, that are scheduled to occur between March 1 and September 30, 2026. If a required runoff for any such election or a subsequent qualifying round in a non-partisan primary system could change the market’s outcome, the market will remain open until that contest is conclusively called by this market’s resolution sources.
A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time of their nominating election. A candidate without a ballot-listed affiliation to either the Democratic 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 prior to the conclusion of the relevant nominating election.
The resolution source for this market will be the Associated Press, Fox News, and NBC. This market will resolve once all three sources have conclusively called all relevant nominating elections. If all three sources do not achieve consensus in calling the relevant races for this market, it will resolve based on official state certification of the nominating election results.Two confirmed primary defeats for Republican Senate incumbents—Bill Cassidy in Louisiana and John Cornyn in Texas, both to Trump-endorsed challengers—have established a baseline of two losses, the first such pair since 2010. These outcomes, driven by shifts toward aligned candidates in competitive GOP fields, anchor trader expectations around a third defeat. Limited additional Senate primary contests remain, with few other incumbents facing serious opposition, supporting the 82% consensus on exactly three total losses. Factors that could alter this include any late-cycle upsets or retirements converting to primary challenges before remaining filing deadlines close.
The 2026 midterm elections are scheduled to be held on November 3, 2026, with congressional primaries running from March through September.
This market will resolve according to the number of Republican Senate incumbents who do not win their nominating election to move on to the general election as a result of the 2026 midterm primary elections.
An incumbent will be considered not to have won their election if they are not declared the winner of the election they sought, including if they withdraw, suspend, or otherwise leave the race at any point after officially registering as a candidate, regardless of the reason. Incumbents who do not officially register as candidates for reelection will not be considered.
This market will resolve based on the results of all Senate nominating elections, including party primaries, top-two or jungle primaries, and primaries for special elections, that are scheduled to occur between March 1 and September 30, 2026. If a required runoff for any such election or a subsequent qualifying round in a non-partisan primary system could change the market’s outcome, the market will remain open until that contest is conclusively called by this market’s resolution sources.
A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time of their nominating election. A candidate without a ballot-listed affiliation to either the Democratic 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 prior to the conclusion of the relevant nominating election.
The resolution source for this market will be the Associated Press, Fox News, and NBC. This market will resolve once all three sources have conclusively called all relevant nominating elections. If all three sources do not achieve consensus in calling the relevant races for this market, it will resolve based on official state certification of the nominating election results.
This market will resolve according to the number of Republican Senate incumbents who do not win their nominating election to move on to the general election as a result of the 2026 midterm primary elections.
An incumbent will be considered not to have won their election if they are not declared the winner of the election they sought, including if they withdraw, suspend, or otherwise leave the race at any point after officially registering as a candidate, regardless of the reason. Incumbents who do not officially register as candidates for reelection will not be considered.
This market will resolve based on the results of all Senate nominating elections, including party primaries, top-two or jungle primaries, and primaries for special elections, that are scheduled to occur between March 1 and September 30, 2026. If a required runoff for any such election or a subsequent qualifying round in a non-partisan primary system could change the market’s outcome, the market will remain open until that contest is conclusively called by this market’s resolution sources.
A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time of their nominating election. A candidate without a ballot-listed affiliation to either the Democratic 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 prior to the conclusion of the relevant nominating election.
The resolution source for this market will be the Associated Press, Fox News, and NBC. This market will resolve once all three sources have conclusively called all relevant nominating elections. If all three sources do not achieve consensus in calling the relevant races for this market, it will resolve based on official state certification of the nominating election results.
Volume
$54,320Market Opened
Jan 14, 2026, 2:51 PM ETResolver
0x2F5e3684c...Two confirmed primary defeats for Republican Senate incumbents—Bill Cassidy in Louisiana and John Cornyn in Texas, both to Trump-endorsed challengers—have established a baseline of two losses, the first such pair since 2010. These outcomes, driven by shifts toward aligned candidates in competitive GOP fields, anchor trader expectations around a third defeat. Limited additional Senate primary contests remain, with few other incumbents facing serious opposition, supporting the 82% consensus on exactly three total losses. Factors that could alter this include any late-cycle upsets or retirements converting to primary challenges before remaining filing deadlines close.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedRelated
Will Democratic Senate incumbents win all their nominating elections in the 2026 cycle?
79%
Will Republican House incumbents not win in between four and six nominating elections in the 2026 cycle?
93%
Will Democratic House incumbents not win in between ten and twelve nominating elections in the 2026 cycle?
50%
Beware of external links.
Beware of external links.
Frequently Asked Questions