Are incumbents becoming a politically endangered species?
Tuesday’s primary produced another House incumbent defeat and saw a sitting Senator finish behind his leading general election opponent. The question now is whether the unusually high number of incumbent setbacks in both parties foreshadows broader political turbulence in November. A deeper look at the margins suggests the warning signs for incumbents are serious.
With Rep. Cory Mills (R‑FL) losing his renomination bid on Tuesday and Sen. Dan Sullivan (R‑AK) placing well behind former U.S. Rep. Mary Peltola in Alaska’s top‑four jungle primary, the tally of incumbents denied renomination now stands at 13, plus Sen. Sullivan’s failure to finish first. Eleven of the defeats have occurred in House races –seven Democrats and four Republicans – while two Senate Republicans have been denied renomination.
The near‑parity between the parties indicates that these results are not driven by overt partisanship. Instead, they reflect a broader anti‑incumbent, and likely anti- establishment, mood. Voters in both parties appear frustrated with the current governing system.
Democrats are nominating avowed socialists in several districts, while Republican base voters, particularly in Senate contests, are signaling dissatisfaction with incumbents they believe are not enacting enough of the Trump agenda.
The most telling statistic is not the number of incumbents defeated, but the margins by which they lost. These figures should concern any incumbent facing voters in November.
Among the eleven House defeats, Democratic incumbents averaged just 40.1 percent of the vote, while their challengers averaged a commanding 56.3 percent. Republican House incumbents fared only slightly better, averaging 41.7 percent to their challengers’ 52.8 percent. These are not narrow repudiations; they are decisive rejections.
The largest losses occurred on the Democratic side. In Texas, Rep. Al Green (D‑Houston) lost a redistricting‑induced incumbent pairing to newly elected Christian Menefee (D‑Houston) by a lopsided 69.3 – 30.7 percent.
While some attribute the margin to redistricting, most of the new 18th District came from Green’s long‑held 9th District, meaning he should have had the advantage. His strong opposition to President Trump was not the issue; rather, his age – approaching 80 – and 22‑year tenure likely weighed heavily against him.
The second‑largest defeat came in New York’s 10th District, where two‑term 50-year-old Rep. Dan Goldman lost 65.8 – 34.0 percent to former New York City Comptroller Brad Lander, who ran as a Democratic Socialist. Here, ideology was the driving factor, despite Goldman himself being a staunch liberal even as an heir to the Levi Strauss fortune.
On August 9th, another veteran Democrat, Connecticut Rep. John Larson – first elected in 1998 and nearing 80 – managed only 32.9 percent against former Hartford Mayor Luke Bronin and two other challengers.
Republican senators also lost in landslide proportion. Louisiana Sen. Bill Cassidy failed even to qualify for the runoff, receiving just 24.8 percent of the vote. In Texas, four‑term Sen. John Cornyn mustered only 36.2 percent in a runoff against scandal-tainted Attorney General Ken Paxton. Turning to Alaska, Sen. Sullivan will likely finish with roughly 43 percent against ex-Rep. Peltola, leaving him a great deal of work to do in a short period to change his trajectory for the general election.
While these primary results suggest an ominous environment for incumbents, they do not necessarily point to a partisan wave. Instead, 2026 is producing unusual and potentially revealing electoral outcomes that underscore voter restlessness across the political spectrum.
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