**Two Republican Senate incumbents—Bill Cassidy (Louisiana) and John Cornyn (Texas)—have already lost renomination in 2026 primaries to Trump-endorsed challengers, establishing the baseline for the market.** Cassidy fell in a May primary after Trump backed Rep. Julia Letlow, while Cornyn lost his May runoff to Texas Attorney General Ken Paxton following Trump’s endorsement. These mark the first such defeats for Texas and notable cases tied to past votes on impeachment and legislative alignment. Trader consensus centers on exactly two or three total losses because additional high-profile challenges have not materialized among the remaining Class II Republican incumbents. Most other seats feature either unopposed or lightly contested primaries, with retirements (such as Joni Ernst) counting separately from primary defeats. Historical precedent shows low rates of Senate incumbent primary losses absent strong intra-party mobilization, which appears concentrated in these two cases. Upcoming or recently completed primaries in states like Alabama, Arkansas, and others show incumbents prevailing by wide margins, reinforcing limited further movement. The market’s pricing on 2 (leading) versus 3 reflects the two confirmed outcomes plus modest probability of one more upset before the cycle concludes, consistent with current candidate fields and endorsement patterns.
Experimentelle KI-generierte Zusammenfassung mit Polymarket-Daten. Dies ist keine Handelsberatung und spielt keine Rolle bei der Auflösung dieses Marktes. · Aktualisiert2 58.6%
0 <1%
1 <1%
4 <1%
$30,182 Vol.
$30,182 Vol.
0
<1%
1
15%
2
70%
3
41%
4
<1%
>4
<1%
2 58.6%
0 <1%
1 <1%
4 <1%
$30,182 Vol.
$30,182 Vol.
0
<1%
1
15%
2
70%
3
41%
4
<1%
>4
<1%
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.
Markt eröffnet: Jan 14, 2026, 2:51 PM ET
Resolver
0x2F5e3684c...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.
Resolver
0x2F5e3684c...**Two Republican Senate incumbents—Bill Cassidy (Louisiana) and John Cornyn (Texas)—have already lost renomination in 2026 primaries to Trump-endorsed challengers, establishing the baseline for the market.** Cassidy fell in a May primary after Trump backed Rep. Julia Letlow, while Cornyn lost his May runoff to Texas Attorney General Ken Paxton following Trump’s endorsement. These mark the first such defeats for Texas and notable cases tied to past votes on impeachment and legislative alignment. Trader consensus centers on exactly two or three total losses because additional high-profile challenges have not materialized among the remaining Class II Republican incumbents. Most other seats feature either unopposed or lightly contested primaries, with retirements (such as Joni Ernst) counting separately from primary defeats. Historical precedent shows low rates of Senate incumbent primary losses absent strong intra-party mobilization, which appears concentrated in these two cases. Upcoming or recently completed primaries in states like Alabama, Arkansas, and others show incumbents prevailing by wide margins, reinforcing limited further movement. The market’s pricing on 2 (leading) versus 3 reflects the two confirmed outcomes plus modest probability of one more upset before the cycle concludes, consistent with current candidate fields and endorsement patterns.
Experimentelle KI-generierte Zusammenfassung mit Polymarket-Daten. Dies ist keine Handelsberatung und spielt keine Rolle bei der Auflösung dieses Marktes. · Aktualisiert

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