Four House members have already lost their seats in primary challenges this election cycle, and roughly a dozen more are in genuine peril. The threat extends across the country, from coast to coast, with some of the most vicious battles erupting within parties rather than between them.
Redistricting has scrambled the terrain in unexpected ways. In California next week, two Republican incumbents will face off against each other, a direct result of Democratic mapmakers redrawing district lines. That race follows the shocking primary losses of two Democratic members in Texas just days earlier, signals that even entrenched incumbents cannot assume safety.
The heaviest fire is being aimed at Democrats. A wave of younger challengers is targeting establishment figures in California, arguing that voters are hungry for generational change. Representatives Mike Thompson, Doris Matsui, Brad Sherman, Jimmy Gomez, and Linda Sánchez are all fending off energetic primary opponents. Some of these races are becoming financially competitive. Entrepreneur Eric Jones has poured over $5 million into his own campaign against Thompson. Jake Levine managed to nearly outraise Sherman with a $500,000 personal loan to his campaign.
The incumbents themselves are signaling real alarm. Matsui's campaign has taken the unusual step of appealing to outside groups to boost a Republican candidate, a tactical move designed to prevent Democrat Mai Vang, a Sacramento City Council member, from advancing to challenge her in a general election. Such defensive maneuvering suggests genuine vulnerability.
Beyond California, the pattern repeats in other states. Democratic Representatives Stephen Lynch in Massachusetts, John Larson in Connecticut, Ed Case in Hawaii, Diana DeGette in Colorado, Shri Thanedar in Michigan, and Adriano Espaillat in New York are all facing primary challenges from much younger Democrats demanding fresh faces and new approaches.
In Connecticut, John Larson is battling former Hartford Mayor Luke Bronin, who has outraised the 28-year incumbent and won the state Democratic Party endorsement. Larson, a former member of House leadership and Ways and Means Committee member, has dismissed the party's choice as unrepresentative of voter sentiment. He argues his seniority and accumulated power serve Connecticut better than a freshman would.
Bronin counters that congressional seats should not be lifetime positions. He claims Larson's indignation at the very suggestion he step aside reveals the entitlement plaguing the Democratic establishment. "Congressional seats were not meant to be lifetime appointments and the Democratic Party would be so much stronger if we had more people who recognize that part of leadership is knowing when it's time to pass the torch," Bronin said.
Larson disputed Bronin's account of a private meeting between them, saying the younger politician told him directly to make way. "He told me he was going to turn me into Joe Biden, and I was in for a tough slog," Larson recounted. Bronin flatly denied the characterization, telling NBC News that the conversation "has almost no resemblance" to what actually occurred.
Progressive groups are fueling much of the anti-incumbent movement. Justice Democrats, the organization that backed Alexandria Ocasio-Cortez's insurgent primary win, has endorsed a slate of 2026 challengers across multiple states. Our Revolution, born from Bernie Sanders' 2016 presidential campaign, is backing an overlapping group of candidates. Some races are mixing generational grievance with ideological struggle between progressives and moderates, though the age question often dominates.
Maryland's Democratic primary defies easy categorization. Representative April McClain Delaney faces former Representative David Trone, who left the seat to pursue a failed Senate bid. Both are independently wealthy and self-funding. Trone has invested $10 million compared to Delaney's $2 million. The race has turned hostile, with Trone attacking Delaney's immigration votes while she tries to tie him to Republicans through his past donations.
The most brutish primary contest may be between California Republicans Ken Calvert and Young Kim, now forced into the same district by Democratic redistricting. Kim has rebranded herself as a "100%" Trump supporter after years distancing herself from him in more moderate districts. Calvert has hit back hard, even alleging her past Trump criticism helped incite the assassination attempts on Trump and Cabinet officials at the White House Correspondents' Association dinner. Kim has recently begun running ads resurrecting a 1990s incident in which Calvert was caught in a car in a sex act with a woman identified as a prostitute.
Both Calvert and Kim enjoy strong standing among House Republicans. Calvert chairs a key subcommittee while Kim has held a competitive Orange County seat through difficult years. Their clash will eliminate one well-regarded Republican member from the House.
"Republicans are going to lose a great member one way or the other in this district," said Dave Gilliard, a longtime California Republican strategist. "When the stakes are this high, and careers are on the line, it's to be expected the rhetoric will get hotter and hotter and hotter."
Author Sarah Mitchell: "These primaries reveal a genuine hunger for change within both parties, but Democrats are getting flattened by it while Republicans at least contained the damage to one district."
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