Colorado Democrats – In the June 30 Colorado Democratic primary, longtime Rep. Diana DeGette, 68, was upset by 29-year-old Melat Kiros, a self-described democratic socialist. The state’s Senate and governor races also delivered shock-and-countershock results: Sen. John Hickenloope
For months. Colorado Democrats have been fighting the same argument in different rooms: who the party should be when voters are angry. scared. and increasingly pulled toward candidates far to the left. On June 30, that generational and ideological tug-of-war broke into separate races — and the split was unmistakable.
In Denver’s deep-blue congressional district, longtime Rep. Diana DeGette, 68, was upset by political newcomer Melat Kiros, 29, who identifies as a democratic socialist. In the race for Colorado’s Senate nomination, incumbent Sen. John Hickenlooper, 74, held off a challenge from state Sen. Julie Gonzales, 43, whose campaign leaned left and argued it was time for a new voice in Washington. And in the gubernatorial primary, Sen. Michael Bennet lost after a campaign that. like many Democratic primaries in 2026. turned less on policy disagreements than on who could most effectively confront the Trump administration’s staunchly conservative agenda.
Across the country. Democrats are heading into November facing the same big math — polls show Democrats are favorites to retake Congress — but the party’s internal debate is getting sharper. A surge of anti-establishment energy has emboldened younger. more progressive contenders. even as some veteran figures push back against what they call a socialist insurgency.
New York primaries had already signaled the fight’s direction. Candidates endorsed by New York City Mayor Zohran Mamdani won three Democratic congressional primaries on June 23. including a slate that aligns with Mamdani’s more left-leaning vision. In Colorado. the Mamdani-era question arrived in the most personal form for one of the state’s best-known lawmakers: Kiros versus DeGette.
DeGette’s district had been so solidly Democratic that former Vice President Kamala Harris won it by 56 percentage points in 2024. DeGette herself first won the seat in 1996, a year before Kiros was even born. During the campaign, DeGette emphasized relationships on Capitol Hill and her opposition to Trump. She was among the group of House Democrats who skipped Trump’s 2026 State of the Union address in protest.
But those credentials weren’t enough. Kiros campaigned on concerns younger. more progressive Democrats frequently cite. including the rise of artificial intelligence and Israel’s alleged war crimes in Gaza. Kiros also gained online notoriety after being fired by her law firm in New York. following a letter she wrote in November 2023 that was sharply critical of Israel.
The result is likely to intensify the internal Democratic argument that has been growing since Mamdani’s win in New York City. Democratic socialists have posted upsets in major cities such as Washington, D.C. and Seattle. and in liberal-leaning congressional districts. drawing criticism from some centrist party figures who argue that farther-left candidates and their platforms could be a liability in swing states.
That tension is already quantifiable. A Pew Research Center survey released in January found that 32% of Democratic voters like leaders who describe themselves as democratic socialists, while 11% dislike the term.
The same ideological story played out in different key, though the candidates and the stakes weren’t the same. In the gubernatorial primary, Sen. Michael Bennet was upset by state Attorney General Phil Weiser.
For much of 2025. frustrated Democratic voters complained that party leaders in Washington weren’t doing enough to resist the “returning Trump administration’s bulldozing agenda.” That dissatisfaction helped Weiser find traction. even though the race began as uphill for him due mostly to Bennet’s name recognition.
Bennet, a three-term senator, led the primary by as much as 31 percentage points in 2025 polls. But Weiser closed the gap by raising a record more than $6.5 million, compared with the $4.8 million Bennet raised.
Weiser made the campaign about fighting back against Trump, who is deeply unpopular in the state. The anti-Trump case sharpened further after Gov. Jared Polis. the Democratic incumbent. commuted a nine-year prison sentence for Tina Peters. a former county clerk convicted for letting someone access data from a secure voting system. Trump had demanded Peters’ release and threatened to withhold federal funds from Colorado if his demand wasn’t met.
Both Weiser and Bennet criticized Polis’ decision to let Peters out of prison. Bennet also promised that if he won the election, he would hold his Senate seat until taking office rather than allowing Polis to fill the vacancy.
Weiser, in turn, tried to separate himself by emphasizing that he has sued the president 66 times. He also attacked Bennet, calling out the senator for supporting parts of the president’s agenda, including voting to confirm at least eight of Trump’s cabinet nominees.
The generational fight didn’t disappear in the Senate race — it simply took another form. If centrists were searching for proof their version of the Democratic coalition can withstand the “blue wave,” they got their closest answer in Colorado.
The contest became a generational referendum. Incumbent Sen. John Hickenlooper, 74, a former Colorado governor and Denver mayor, fended off state Sen. Julie Gonzales, 43, with a decisive win.
Gonzales ran decisively to the left, supporting Medicare-for-all, raising the minimum wage, and cracking down on junk fees. She argued younger voices were needed on Capitol Hill, a theme that has appeared in many 2026 Democratic primaries.
Hickenlooper will now face Republican Mark Baisley, who ran unopposed in the GOP primary. Experts give Republicans very little chance of flipping the Senate seat this fall, pointing to the fact that the state has been trending heavily Democratic over the past decade.
The sequence leaves Democrats with an uncomfortable mirror: in the same June 30 set of primaries, voters backed both the insurgent-left approach that unseated a veteran congresswoman and the institution-and-experience approach that kept a long-serving senator in place.
Colorado primary Melat Kiros Diana DeGette John Hickenlooper Julie Gonzales Michael Bennet Phil Weiser Zohran Mamdani democratic socialist Pew Research Center Medicare-for-all junk fees Trump administration Tina Peters Jared Polis