Recent primary challenges in Texas and Louisiana explain why traders assign the highest probabilities to one or two Republican Senate incumbents losing their nominations. In Texas, incumbent John Cornyn finished the March primary just ahead of Attorney General Ken Paxton and now faces a May 26 runoff, with intraparty divisions over spending and leadership testing his support. In Louisiana, Senator Bill Cassidy competes in the May 16 primary against Representative Julia Letlow, who carries a Trump endorsement, alongside state Treasurer John Fleming. Most other Republican incumbents, including those in Arkansas, Idaho, and Iowa, have advanced with limited or no serious opposition, keeping the odds of zero or three-plus losses lower. These two contests remain the decisive variables in the near term.
Résumé expérimental généré par IA à partir des données Polymarket. Ceci n'est pas un conseil de trading et ne joue aucun rôle dans la résolution de ce marché. · Mis à jour1 38%
0 20%
2 15.0%
3 8.1%
0
15%
1
38%
2
22%
3
17%
4
7%
>4
4%
1 38%
0 20%
2 15.0%
3 8.1%
0
15%
1
38%
2
22%
3
17%
4
7%
>4
4%
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.
Marché ouvert : 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...Recent primary challenges in Texas and Louisiana explain why traders assign the highest probabilities to one or two Republican Senate incumbents losing their nominations. In Texas, incumbent John Cornyn finished the March primary just ahead of Attorney General Ken Paxton and now faces a May 26 runoff, with intraparty divisions over spending and leadership testing his support. In Louisiana, Senator Bill Cassidy competes in the May 16 primary against Representative Julia Letlow, who carries a Trump endorsement, alongside state Treasurer John Fleming. Most other Republican incumbents, including those in Arkansas, Idaho, and Iowa, have advanced with limited or no serious opposition, keeping the odds of zero or three-plus losses lower. These two contests remain the decisive variables in the near term.
Résumé expérimental généré par IA à partir des données Polymarket. Ceci n'est pas un conseil de trading et ne joue aucun rôle dans la résolution de ce marché. · Mis à jour
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