- Will Republican House incumbents not win in between four and six nominating elections in the 2026 cycle?95¢95%
- Will Republican House incumbents not win in between seven and nine nominating elections in the 2026 cycle?4¢4%
Trader consensus heavily favors 4-6 Republican House incumbents losing their primaries (95.2% implied probability), reflecting the limited number of defeats recorded so far in the 2026 cycle and the absence of widespread additional challenges. Several factors explain this positioning. Historical patterns show low incumbent primary defeat rates in non-redistricting-heavy cycles, typically averaging around 6-7 total House losses across both parties. In 2026, redistricting in states like Texas contributed to early losses, including Rep. Dan Crenshaw, while targeted Trump-endorsed challenges ousted critics such as Rep. Thomas Massie. Other defeats, including Reps. Andy Ogles and Cory Mills, stemmed from scandals, local dynamics, or campaign issues rather than a broad wave. Reports through September 2026 indicate roughly four Republican House primary losses total, consistent with or slightly above postwar averages but far from record levels. With most primaries concluded by mid-to-late 2026 and no major late-cycle disruptions reported in remaining contests, the market prices in at most one or two additional defeats. A shift toward 7-9 would require several unexpected high-profile upsets in battleground primaries, which have not materialized amid the cycle's focus on general election dynamics and internal polling showing broader general election vulnerabilities instead.
Rules
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 House 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 House 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. Members of the House of Representatives who are "delegates” or “resident commissioners” not chosen by the people of a state are not included for purposes of resolving this market. 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.