House Democrats Reel as DeGette Becomes Third Incumbent Toppled by Democratic Socialist Challenger
House Democrats erupted in alarm Wednesday after Rep. Diana DeGette of Colorado became the latest longtime incumbent to fall to a democratic socialist primary challenger, extending a streak of upsets that is reshaping the caucus's left flank. Melat Kiros, a 29-year-old attorney and PhD student, led DeGette by nearly 10 percentage points as of Wednesday morning in the Denver-based district. The loss landed harder than most because DeGette was no centrist — and her colleagues know it.
House Democrats erupted in alarm Wednesday after Rep. Diana DeGette of Colorado became the latest longtime incumbent to fall to a democratic socialist primary challenger, extending a streak of upsets that is reshaping the caucus's left flank. Melat Kiros, a 29-year-old attorney and PhD student, led DeGette by nearly 10 percentage points as of Wednesday morning in the Denver-based district. The loss landed harder than most because DeGette was no centrist — and her colleagues know it.
A Progressive Incumbent, Beaten on Progressive Turf
DeGette's backers had sought to defend her record, pointing to her support for Medicare for All, her opposition to ICE, and her role as a Trump impeachment manager. That résumé did not hold. Pro-Kiros advertising zeroed in on DeGette's corporate PAC funding and her votes in favor of Israel, and the message landed with younger urban voters.
Outside spending heavily favored DeGette. Groups tied to the Democratic establishment and AIPAC poured money into the race, substantially outspending progressive organizations such as Justice Democrats, which backed Kiros. The spending gap did not translate to a win.
One House Democrat, speaking anonymously to share candid analysis with Axios, framed the defeat not as an ideological rebuke but a generational one — calling it "one more case in the growing dynamic of performative politics." The member argued that a younger, more outspoken style has become more attractive to motivated urban left voters, regardless of where incumbents actually stand on policy.
Third Loss in Two Weeks Signals Structural Shift
DeGette's defeat follows the ouster last week of Reps. Dan Goldman and Adriano Espaillat of New York, both toppled by challengers backed by New York Mayor Zohran Mamdani. A senior House Democrat called DeGette's result a "wake-up call." A fourth member told Axios that Donald Trump's 2024 victory functioned as an accelerant for the Democratic Socialists of America, predicting that DSA would win safe-seat primaries with young, college-educated urban voters — and characterizing the current results as no surprise.
Not every Democrat is sounding the alarm. Rep. Ro Khanna of California, who backed Kiros, told Axios that the progressive movement represents the energy of the party nationally. Rep. Emily Randall of Washington said she sent Kiros a note of congratulations and looks forward to welcoming her.
More Primaries Ahead as Left Targets Half a Dozen Seats
Progressive groups are not stopping with Denver. Challengers are being backed in races across the country, including Donavan McKinney in Michigan, Oliver Larkin and Elijah Manley in Florida, Mai Vang and Angela Gonzalez-Torres in California, and Kai Newkirk in Arizona — enough to potentially unseat as many as a half-dozen more incumbents this cycle.
"A week after NYC, there is momentum," a fifth House Democrat told Axios. Whether that momentum reshapes the caucus's composition heading into the next Congress now depends on how many of those challengers can replicate what Kiros did in Denver.