Rep. Diana DeGette, D-Colo., a 30-year incumbent, lost to a Democratic Socialists of America (DSA)-backed challenger in a high-profile primary on Tuesday evening.
Melat Kiros, a 29-year-old socialist, defeated DeGette in a Democratic primary for a deep-blue House seat anchored in Denver, according to The Associated Press, scoring a major victory for the socialist left on Tuesday evening.
The DSA had been aiming to cast DeGette’s loss as evidence of its growing momentum after a slate of socialist candidates won Democratic primaries in New York City last week.
“Today, the East Coast, next week the Mountain West,” the DSA wrote in a social media post last week.
SOCIALISTS CHEER ‘SHOCKWAVE’ PRIMARY NIGHT AS DSA-BACKED CANDIDATES WIN, ADVANCE ACROSS THE MAP
If elected in November, Kiros, who was born in Ethiopia, will likely join the ranks of the far-left group known as the Squad and become one of a handful of the House chamber’s outspoken socialists.
The millennial challenger was endorsed by Sen. Bernie Sanders, I-Vt., Rep. Alexandria Ocasio-Cortez, D-N.Y., and the anti-incumbent leftist organization Justice Democrats. Controversial socialist streamer Hasan Piker, who has said Hamas is “a thousand times better” than Israel and praised the Chinese Communist Party, also backed Kiros’ insurgent primary run.
DeGette, a member of the Congressional Progressive Caucus who supports abolishing Immigration and Customs Enforcement (ICE), sought to win a 16th House term by flexing her leftist bona fides. She argued her seniority on an influential House committee would allow her to push for Medicare-for-All legislation — a longtime priority of the party’s far-left flank.
DeGette, who was endorsed by former CPC Chairwoman Pramila Jayapal, D-Wash., also spotlighted her experience as an impeachment manager during Trump’s second impeachment trial in 2021.
Though DeGette and Kiros shared few policy disagreements, they diverged sharply over Israel and antisemitism. Kiros also sharply criticized DeGette for accepting corporate PAC contributions.
Kiros, a PhD student and lawyer, was fired from a New York firm in 2023 after publishing an open letter, arguing that pro-Palestinian student protesters calling for the elimination of Israel were not antisemitic and appearing to defend Hamas.
WATCH: HOUSE DEMS UNLOAD ON TEXAS DEMOCRAT OVER ‘DEMENTED’ ANTISEMITIC COMMENTS
She has also described the Oct. 7, 2023, attacks against the Jewish state as the “inevitable consequence of apartheid” and declined to characterize the deadly firebombing of protesters in Boulder last year who were urging the release of hostages held by Hamas in Gaza as antisemitic.
“I don’t know what was in the heart of the perpetrator,” Kiros told Colorado’s 9News in a recent television interview. “All I know is that he went and attacked innocent people because of what they might have believed.”
A June 2025 bipartisan resolution condemning the attack as part of a “rise in ideologically motivated attacks on Jewish individuals” won every present lawmaker’s support, except for Reps. Rashida Tlaib, D-Mich., and Thomas Massie, R-Ky., who voted present.
Kiros has also suggested the United States deserved 9/11.
“Inevitable in the sense that we destabilized a lot of the Middle East that forced people to believe that another act of violence was the only response,” Kiros told 9News when asked if she thought the terror attack was “the inevitable consequence of American foreign policy.”
“And again, just like I said before, our responsibility is to get rid of those conditions that lead to violence in the first place,” Kiros continued.
DeGette argued that Kiros’ embrace of Piker and her comments about antisemitism and 9/11 were disqualifying.
“I’m shocked and disgusted that Kiros is doubling down on excusing terrorism and the murder of innocent people,” the 30-year incumbent wrote on Facebook earlier this month.
Colorado’s 1st Congressional District is the most liberal seat in the state and voted for former Vice President Kamala Harris by 56 points in 2024.
The primary fight was further scrambled by University of Colorado Regent Wanda James, also running for DeGette’s seat. Though James did not pose the same threat as Kiros, her vote share could ultimately have swayed the contest.