Colorado Democrats face a test of how far left the party will go

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A week after a trio of progressive House candidates backed by New York City Mayor Zohran Mamdani swept their races over establishment favorites, Colorado’s primaries on Tuesday will test whether the left’s momentum can travel west.

The Democratic Socialists of America is backing an insurgent against one of the state’s most established Democratic House incumbents. More broadly, a wider field of progressive challengers is pressing the establishment in races the DSA has stayed out of, a sign of how much leftward energy is coursing through the primary even beyond the group’s own slate. (edited)

“As an American, I don’t like the DSA. As a Democrat, I don’t like the DSA,” said Adam Frisch, a former Colorado congressional candidate now working to help the centrist wing of the party.

The question Tuesday is whether reliably blue Colorado feels the same way. Re-electing or elevating the relatively moderate incumbents could suggest New York’s results owed more to Mamdani’s singular appeal than to any broad hunger among rank-and-file Democrats for a leftward turn. Ousting them would land as a warning shot to the party establishment.

The DSA has been explicit about its ambitions. “Today, the East Coast,” the group wrote on X last week, “next week the Mountain West.”

Here are the races to watch.

Kiros vs. DeGette

In the state’s 1st Congressional District, 29-year-old Melat Kiros — backed by both the DSA and Sen. Bernie Sanders, I-Vt. — is attempting an uphill bid to unseat Rep. Diana DeGette, 68, who has held the reliably blue Denver-based seat since the 1990s. (A third candidate, Wanda James, a member of the University of Colorado Board of Regents, is also running, though she has struggled to break through in a race that has focused largely on the matchup between Kiros and DeGette.)

Kiros, an Ethiopian-born PhD student and former lawyer, has campaigned heavily on her opposition to funding military aid to Israel while also calling to abolish Immigration and Customs Enforcement and backing universal healthcare. She cast herself as an agent of generational change. The race, she told MS NOW, is “about addressing the corruption and actually fighting for the policies that are going to help working families.” Establishment Democrats who “have been in their seats for decades at a time,” she added, “aren’t up to that task.”

DeGette, meanwhile, has leaned on her experience on the Hill while also touting her own progressive bona fides, including her record fighting the Trump administration, her seniority on the Energy and Commerce Committee and her leadership of the Reproductive Freedom Caucus in the House.

Kiros’s stance on Israel has played a key role in the race, underscoring its growing salience for Democratic primary voters. Her biography on the website of the Justice Democrats, which also endorsed her, suggests that she lost her job as a lawyer in New York City after writing an essay defending college students protesting Israel’s war in Gaza. She has also castigated establishment Democrats for being too willing, in her view, to take money from AIPAC, writing on X in September: “We cannot wait for them to find the courage to stand for what’s right, it’s time to clean house on all of them.”

Kiros recently faced criticism from progressive leaders for declining to characterize last year’s deadly Boulder firebombing at a pro-Israel demonstration — which led to the death of an 82-year-old woman — as antisemitic in a local news interview. (In an interview with MS NOW’s Jacob Soboroff this weekend, Kiros called the firebombing “a horrific attack on a group of Jewish people that were peacefully protesting,” and called to distinguish antisemitism from anti-Zionism.)

DeGette has rarely faced a serious electoral challenge during her decades in Congress.