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.

“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. 

Gonzales vs. Hickenlooper

State Sen. Julie Gonzales, a former DSA member, is running to unseat Sen. John Hickenlooper, a 74-year-old Democrat who formerly served as Denver’s mayor and Colorado’s governor. Hickenlooper was first elected to the Senate in 2020 after a short-lived campaign for president he launched — and ended — the year before.

Gonzales, who has served in the state Senate since 2019, has centered her campaign on affordability, but has also taken a vocal stance on Israel, including by backing an arms embargo to the country. She has also taken Hickenlooper to task for voting to confirm President Donald Trump’s nominees for the secretaries of Agriculture, Energy and the Treasury. But Hickenlooper has cash on his side, having raised $9.8 million in the race to her approximately $870,000, per FEC filings.

State Sen. Mark Baisley is running unopposed for the GOP nomination in the race.

A heated primary in a battleground seat

Colorado’s 8th District is widely considered one of the most competitive races in the country, as Republican Rep. Gabe Evans seeks reelection in a cycle likely to favor Democrats. On the left, a three-way race for the Democratic nomination is widely expected to come down to former state Rep. Shannon Bird and current state Rep. Manny Rutinel.

Rutinel has positioned himself as the more progressive choice of the two, though the Denver chapter of the DSA has declined to endorse his candidacy after he allegedly changed his stances on several issues, including funding for Israel, in a recent interview with the Colorado Sun. Bird — who raised about half as much as Rutinel did, per FEC filings — has a reputation as a moderate dating to her days in the statehouse. The candidates’ positions on ICE has emerged as a flashpoint in the race — the district they are competing to represent is 40% Latino — with both leading candidates touting their support for reforming the agency.

Other races

In the governor’s race, Sen. Michael Bennet was widely considered a shoo-in when he launched his candidacy last year. But state Attorney General Phil Weiser has run hard to Bennet’s left, touting himself as a change candidate who can carry the state in a more progressive direction than Bennet, who has a reputation as a moderate. The race has been an expensive one, with Weiser taking in roughly $6.7 million to Bennet’s $5.8 million. Four Republicans are running for the GOP nomination in the race, but Colorado has not elected a Republican governor since 1998.

In the 5th Congressional District, Democrats are hoping either Jessica Killin or Joe Reagan — both Army veterans — can knock off Republican Rep. Jeff Crank. Killin, a former chief of staff to onetime second gentleman Doug Emhoff, has vastly outraised Reagan, who narrowly lost the 2024 Democratic primary for the seat. The Democratic Congressional Campaign Committee has backed Killin; the DSA has stayed out.

Hunter Woodall contributed to this article.

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