Overview
Progressive Democrats delivered a string of notable primary victories in Colorado on Tuesday night, unseating an entrenched incumbent and reshaping the state's Democratic ticket. The outcomes underscore friction within the party over issues including Israel, immigration enforcement and ties to corporate political action committees.
Key Results
In the Denver area, Melat Kiros, a 29-year-old Ethiopian-born former New York attorney and current doctoral student at the University of Denver, defeated U.S. Representative Diana DeGette in a stunning upset. DeGette had represented the seat for 29 years and was a 68-year-old member of the Congressional Progressive Caucus. With more than 90% of ballots counted, Kiros led by roughly 10 points.
In Colorado’s 8th Congressional District, which has a large Latino population and is a battleground held by Republican Gabe Evans, progressive state Representative Manny Rutinel won the Democratic primary over former state Representative Shannon Bird. That seat is considered competitive heading into the general election.
Attorney General Phil Weiser won the Democratic nomination to succeed term-limited Governor Jared Polis, defeating U.S. Senator Michael Bennet in the primary. Weiser outraised Bennet by more than $1 million and campaigned on his record of suing the Trump administration while criticizing Bennet as a Washington insider. The race featured approximately $11 million in outside spending that had favoured Bennet. Bennet will remain in the U.S. Senate, where his seat is not up for reelection until 2028.
Seat-specific context and dynamics
Melat Kiros’ victory over Diana DeGette was the largest upset of the night. Both candidates share positions on issues such as Medicare for All and abolishing U.S. Immigration and Customs Enforcement (ICE), but differed sharply on policy toward Israel: Kiros has called for ending wars and stopping military aid to Israel, while DeGette supported sending only defensive weapons to Israel. Kiros received an endorsement from Senator Bernie Sanders.
In the 8th District, Republican incumbent Gabe Evans quickly sought to exploit Rutinel’s primary win, likening Rutinel to New York Mayor Zohran Mamdani and labeling him a far-left, radical socialist who supports eliminating oil and gas and defunding law enforcement. Evans’ seat is a high-priority target for Democrats; the GOP won it narrowly in 2024 when Evans defeated Democrat Yadira Caraveo by less than one percentage point. Former President Donald Trump carried the district by less than two percentage points in 2024. Entering the general election, Evans reported $3.4 million on hand versus Rutinel’s $910,000, giving the Republican a substantial cash advantage.
Incumbents who held and those who fell
One incumbent, Senator John Hickenlooper, 74, withstood a vigorous progressive challenge from state Senator Julie Gonzales, a labor organizer who advocated an arms embargo on Israel and limits on ICE. Hickenlooper raised nearly $10 million for his Senate primary, while Gonzales reported $870,000 and drew endorsements from labor unions and progressive organizations. Despite the strength of her challenge, Hickenlooper is expected to be an easy favorite in the general election.
Broader implications within the Democratic Party
Taken together with primary outcomes in New York and Maine, the Colorado results suggest a segment of Democratic voters is embracing a new generation of insurgent candidates who reject corporate PAC contributions, take tougher stances on Israel, and position themselves as anti-establishment advocates for working-class voters. U.S. Representative Ro Khanna, a progressive from California and potential 2028 presidential candidate, summarized the mood: "The energy in our party is with bold progressives willing to stand up against foreign wars, ICE and the billionaire class. The insurgent candidates are tapping into this sentiment, and win or lose, they are pointing the direction for our party."
Electoral and campaign finance considerations
The primary contests highlighted contrasts in fundraising and outside spending. Weiser’s fundraising edge of more than $1 million over Bennet and the roughly $11 million in outside spending that favored Bennet framed their gubernatorial primary. Hickenlooper’s near $10 million war chest dwarfed Gonzales’ $870,000. In the 8th District, Rutinel faces a material cash gap against Evans, which raises questions about the ability of progressive nominees to compete in tightly balanced general election districts.
Looking ahead
Rutinel’s nomination may prompt renewed discussion inside the Democratic Party over which candidate archetypes are most viable in competitive districts. The primary results also reinforce intra-party debate about foreign policy and immigration enforcement priorities. With control of the U.S. House still in play nationally, the outcome in Colorado's closely contested districts will be watched as part of the broader midterm landscape.
Conclusion
Tuesday’s Colorado primaries produced a mixed outcome for the Democratic Party: high-profile progressive wins that displace established officials, alongside successful defenses by more moderate incumbents who command substantial fundraising advantages. The results expose fault lines over policy and electoral strategy that will influence both state and national races in the months ahead.