That episode became part of the campaign’s broader argument: Kiros cast herself as someone willing to confront powerful institutions, while critics portrayed her views and associations as too far outside the party mainstream. Voters in the district appear to have been less concerned about that warning label than DeGette’s campaign might have hoped.
The result fits into a larger pattern this summer. Left-wing candidates, including democratic socialists, have not simply been making noise in safe Democratic areas; in some races, they have been winning. That is a rather important distinction, and one party strategists may now be forced to acknowledge without the usual soothing spreadsheet language.
The Left Adds to a Run of Primary Wins
Kiros is the latest democratic socialist to defeat an incumbent Democrat in a primary season that has exposed tensions inside the party over Gaza, housing costs, immigration, and the influence of long-serving officials.
In New York City, three candidates with ties to the Democratic Socialists of America and endorsed by Mayor Zohran Mamdani also won their primaries. Those victories, paired with Kiros’s win in Colorado, give progressives another argument that their politics can work inside Democratic primaries, particularly in urban districts where the general election is not the main obstacle.
There are limits to the lesson. Safe Democratic seats are not the same as swing districts, and primary electorates are not the full November electorate. Still, ousting a 15-term incumbent is a concrete result, not a social media mood.
Phil Weiser Defeats Michael Bennet for Governor Nomination
Tuesday’s Colorado results also produced a major statewide result. Colorado Attorney General Phil Weiser defeated United States Senator Michael Bennet for the Democratic nomination for governor, according to US media projections.
The race centred heavily on who was best positioned to defend Colorado against President Donald Trump. Trump froze federal funds to the state and vetoed a major drinking water project in Colorado, where voters have moved toward Democrats over the past two decades.
Weiser argued that his record as attorney general made him the stronger choice. He pointed to legal fights against the Trump administration, including challenges to the federal funding freeze and Trump’s attempt to end birthright citizenship.
Money also mattered. Weiser raised and spent more than Bennet, giving him the resources to define the race and press his case to voters. He is expected to win the governorship in November.
Manny Rutinel Wins in a Key House Battleground
In another closely watched race, State Representative Manny Rutinel won the Democratic nomination to challenge Republican United States Representative Gabe Evans in a battleground district. Democrats view the seat as one of their top pickup opportunities in the November 3 midterm elections.
Rutinel, a progressive, defeated moderate former State Representative Shannon Bird in a primary campaign that focused heavily on immigration. The district covers Denver’s northern suburbs and nearby rural areas, and is nearly 40 percent Latino.
Evans narrowly won the seat in 2024 and enters the general election with a substantial financial advantage. His campaign reported $3.4m in cash on hand, compared with Rutinel’s $910,000. That gap does not decide an election by itself, but it buys a lot of advertising and even more consultant confidence.
Why Colorado’s Results Matter for Congress
The national stakes remain straightforward. Trump’s Republican Party holds slim majorities in both the United States House of Representatives and the Senate. Democrats need to gain a net three seats to take control of the House in November and four to win the Senate.
That gives Democrats two arguments to take from Colorado’s results. Kiros’s win suggests the party’s left can defeat establishment incumbents in safe seats. Rutinel’s nomination will test whether a progressive candidate can win in a competitive district where campaign money, immigration politics, and turnout will all matter.
For now, the signal from Tuesday is clear enough: Colorado Democrats did not choose the safest available version of continuity. In several races, they chose confrontation, and they did so by measurable margins.
