Colorado primaries 2026: Steve Kornacki Previews Democratic Race

Colorado primaries have set off a political earthquake, testing the limits of the Democratic establishment in a high-stakes battleground. As analyzed by the NBC News Politics team at the NBC News Politics Desk, the state of Colorado served as a major battleground where entrenched incumbents confronted existential challenges from the progressive left. Meanwhile, the campaign trail collided with massive judicial developments as the Supreme Court concluded its term with a series of landmark rulings that will reshape the electoral and constitutional landscapes for years to come.

This edition of the newsletter breaks down the dramatic results of the June 30, 2026, primary elections in Colorado, examines the structural shifts within the Democratic coalition through the lens of chief data analyst Steve Kornacki, and provides a comprehensive wrap-up of the final, historic decisions handed down by the nation’s highest court.

Colorado Primaries: A New Era of Anti-Establishment Momentum

The political landscape in Colorado has undergone a profound transformation. Long considered a state dominated by moderate-to-progressive establishment figures, Colorado has increasingly become a prime target for insurgent, left-wing candidates hoping to replicate progressive successes seen nationally. In this primary cycle, two sitting U.S. senators and the state’s longest-serving House representative faced intense, well-organized challenges from their left flank. The resulting contests delivered historic upsets, illustrating the growing appetite for structural change among Denver’s urban electorate and statewide Democratic voters.

The Ousting of Diana DeGette: Melat Kiros’s Seismic Victory

In Denver’s heavily Democratic 1st Congressional District, a truly historic upset took place. Representative Diana DeGette, a 29-year incumbent and 15-term veteran of the House of Representatives, was defeated by Melat Kiros, a 29-year-old democratic socialist. Kiros, whose progressive platform and grassroots energy drew frequent comparisons to Representative Alexandria Ocasio-Cortez, tapped into deep-seated voter fatigue and a demand for generational change within Denver’s progressive base.

DeGette had run on her extensive record, pointing to her senior leadership positions in Congress and her efforts to advance Medicare for All. However, Kiros capitalized on her strong performance at the district-level assembly, where she secured a stunning 67% of the assembly vote to DeGette’s 33%. Despite DeGette and outside groups pouring significant funds into the race to secure her survival, the Associated Press called the race for Kiros, who led the veteran congresswoman by 6 percentage points. This monumental victory establishes Kiros as the projected winner of the deep-blue seat and serves as a powerful signal that anti-establishment energy continues to surge throughout the Democratic party.

Julie Gonzales vs. John Hickenlooper: The Fight for the U.S. Senate Seat

The U.S. Senate primary in Colorado pitted two-term former governor and sitting Senator John Hickenlooper against State Senator Julie Gonzales, a progressive community organizer who has served in the state legislature since 2019. Gonzales ran an aggressive campaign, aligning herself with the state’s expanding democratic socialist wing and criticizing Hickenlooper as a symbol of moderate establishment politics.

Hickenlooper, 74, utilized his overwhelming financial advantage—raising and spending more than ten times as much as Gonzales—to blanket the airwaves with advertisements touting his record on public lands, climate action, and health care. While the Associated Press ultimately projected Hickenlooper as the winner with 57% of the vote, Gonzales’s 43% finish represented a remarkably strong showing for an underfunded progressive challenger. The 14-point margin demonstrated that even one of Colorado’s most enduring and recognizable political figures is not immune to pressure from the party’s left-leaning activist base.

Michael Bennet’s Governor Bid Falls Short to Phil Weiser

Another shocking result came in the Democratic primary for Governor, where sitting U.S. Senator Michael Bennet was upset by Attorney General Phil Weiser. Bennet, who entered the Senate in 2009, had unexpectedly entered the gubernatorial race in April 2025 to succeed the term-limited Governor Jared Polis. On paper, Bennet was the heavy favorite, boasting statewide name recognition and the backing of much of the national Democratic apparatus.

Weiser, however, launched a formidable campaign that tapped into deep frustration with federal gridlock. Emphasizing his localized efforts as attorney general, Weiser criticized the influence of out-of-state billionaires and corporate interests. Weiser set a state record by raising approximately $6.4 million for his primary campaign, outstripping Bennet’s $4.6 million. The gamble paid off: Weiser defeated Bennet by a convincing 10-point margin (55% to 45%), sending Bennet back to his Senate seat in Washington and establishing Weiser as the heavy favorite to win the governor’s mansion in November.

Steve Kornacki’s Take: The Structural Shift Within the Democratic Coalition

Analyzing these primary results, NBC News Chief Data Analyst Steve Kornacki pointed out that the Colorado primaries expose clear regional and demographic fault lines within the modern Democratic coalition. Kornacki observed that while the establishment managed to secure Hickenlooper’s Senate nomination, the loss of a 29-year incumbent like Diana DeGette and the defeat of Michael Bennet indicate a profound shift in suburban and urban voting patterns.

According to Kornacki, the urban centers—most notably Denver—are increasingly realigning around younger, more diverse, and explicitly socialist candidates who reject the incrementalist politics of the older generation. The education and gender gaps that have defined recent national elections are also playing out in these primary contests, where high-income, college-educated progressives are demonstrating a willingness to abandon traditional incumbents in favor of systemic change. Kornacki noted that while the democratic socialist movement still faces structural limits in statewide races, its ability to easily topple long-standing representatives in deep-blue districts will continue to trigger anxiety for Democratic leaders in Washington.

Supreme Court Term Ends: Landmark Rulings and Political Fallout

Beyond the borders of Colorado, the political world was rocked by the conclusion of the Supreme Court’s term. In a flurry of opinions issued on its final day, the conservative supermajority handed down three monumental rulings that immediately reshaped constitutional law and the rules governing the 2026 midterm campaigns. These decisions span immigration, campaign finance, and civil rights, providing potent ammunition for both political parties as they head into the general election.

Upholding Birthright Citizenship in Trump v. Barbara

In a major defeat for the Trump administration, the Supreme Court ruled 6-3 to uphold the constitutional guarantee of birthright citizenship. The case, Trump v. Barbara, centered on an executive order issued by President Trump that sought to deny U.S. citizenship to children born on American soil to parents who are in the country illegally or on temporary visas.

The court’s majority relied on the long-settled post-Civil War understanding of the 14th Amendment’s Citizenship Clause. Five justices concurred on constitutional grounds, while Justice Brett Kavanaugh wrote a concurring opinion arguing that the executive order directly violated federal immigration statutes passed by Congress. The ruling averted a massive humanitarian and legal crisis, with advocacy groups noting that a contrary decision would have resulted in hundreds of thousands of children being born stateless each year. While immigrant rights advocates celebrated the decision, conservative dissenters signaled that limiting birthright citizenship remains a key, long-term goal of the conservative legal movement.

Erasing Party Campaign Spending Limits

In a ruling that will immediately alter the financial dynamics of the 2026 midterms, the Supreme Court struck down a 50-year-old federal law that restricted how much political parties could spend in direct coordination with their candidates. In National Republican Senatorial Committee v. Federal Election Commission, the court split 6-3 along ideological lines, finding that coordinated spending caps violated political parties’ First Amendment free speech rights.

Writing for the majority, Justice Kavanaugh declared that the ruling places all political parties on a level playing field, allowing national committees like the RNC and DNC to coordinate directly and spend unlimited funds in support of congressional and presidential campaigns. In the short term, campaign finance experts warn that this ruling heavily favors Republicans. Heading into the midterms, top Republican campaign committees have stockpiled over $256 million, enjoying a massive $150 million financial advantage over their Democratic counterparts, who are currently carrying millions in debt.

Allowing States to Ban Transgender Athletes

The court also waded directly into the nation’s culture wars, ruling 6-3 that states are constitutionally permitted to bar transgender student athletes from participating on girls’ and women’s sports teams. The decision, which addressed consolidated cases out of West Virginia and Idaho, held that school sports teams can be separated based on “biological sex” without violating the Equal Protection Clause of the Fourteenth Amendment or Title IX.

Justice Kavanaugh, writing for the conservative majority, argued that Title IX was designed to account for physical differences between biological sexes to ensure safety and fair competition for biological females. In a passionate dissent, Justice Sonia Sotomayor criticized the majority for ignoring the factual record and inflicting severe emotional and social harm on transgender youth. While the ruling provides federal constitutional cover for the 27 states that have already enacted trans sports bans, it does not mandate a nationwide restriction. States like California, which allow transgender students to play on teams matching their gender identity, can continue to maintain their inclusive policies.

Comparing the Colorado Primary Results: Establishment vs. Insurgents

The intersection of these localized political shifts and federal changes illustrates the dual pressures acting on the Democratic Party. To conceptualize the scale of the ideological battles that occurred across Colorado, the following table details the key Democratic primary matchups, comparing the establishment-backed figures against the progressive insurgents.

Office / District	Establishment Candidate	Insurgent Candidate	Key Primary Themes	Primary Winner
U.S. House (CO-01)	Diana DeGette (Incumbent)	Melat Kiros (Democratic Socialist)	Generational change, Medicare for All, grassroots mobilization	Melat Kiros (Upset)
U.S. Senate	John Hickenlooper (Incumbent)	Julie Gonzales (State Senator)	Moderate incrementalism vs. democratic socialism, campaign finance	John Hickenlooper
Governor	Michael Bennet (U.S. Senator)	Phil Weiser (Attorney General)	Affordability, federal gridlock, corporate influence in politics	Phil Weiser (Upset)

Looking Ahead to the Midterm General Elections

The fallout from both the Colorado primaries and the Supreme Court decisions will heavily dictate the strategies of both parties as the general election season officially begins. For Democrats, the rise of charismatic progressive candidates like Melat Kiros proves that grassroots energy is deeply concentrated on the left, but it also creates a delicate balancing act for party leadership trying to hold onto competitive suburban swing districts. The shocking defeat of Senator Michael Bennet in his gubernatorial primary highlights the vulnerability of federal figures who are perceived as being too closely aligned with a dysfunctional Washington.

At the same time, the Supreme Court’s campaign finance ruling gives national Republicans an unprecedented financial weapon. With the ability to spend unlimited, coordinated funds directly in key congressional districts, national GOP committees can rapidly deploy their $150 million cash advantage to overwhelm underfunded Democratic nominees. As the campaign trail heats up, the battle for the direction of the Democratic Party and the struggle to combat the GOP’s cash-infused midterm machine will dominate the headlines from the campaign trail to Capitol Hill.