The Democratic Socialists of America (DSA) secured another major primary victory Tuesday, with challenger Melat Kiros defeating 29-year incumbent Rep. Diana DeGette in Colorado's deep-blue 1st Congressional District. Kiros, a 29-year-old former attorney and first-time candidate, is backed by the DSA.

This win follows recent upsets in New York City where DSA-aligned candidates Darializa Avila Chevalier and Claire Valdez defeated establishment-backed contenders. Chevalier ousted Rep. Adriano Espaillat, and Valdez won a primary to succeed Rep. Nydia Velázquez. These victories are seen as emboldening the progressive wing of the Democratic Party in its internal debates with the center-left establishment.

The DSA celebrated the Colorado result, stating on social media, "Another Democratic Socialist is going to Congress! Congresswoman Kiros will take the fight for a better world to D.C: to Abolish ICE, free Palestine, and win Universal Childcare and Medicare for All."

Kiros, who has aligned with Justice Democrats, a group known for supporting members of the progressive "Squad," also gained support from prominent Latino groups. Her victory in the Denver-based district, which President Kamala Harris carried by nearly 56 points in 2024, highlights the growing influence of progressive politics.

In a nearby congressional race, State Rep. Manny Rutinel won the Democratic primary in Colorado's 8th Congressional District, a crucial swing seat. Rutinel defeated former State Rep. Shannon Bird, a more moderate candidate. Rutinel will now face Republican Rep. Gabe Evans in a race considered critical for the GOP's slim House majority.

Immigration was a key issue in the 8th Congressional District primary. Rutinel criticized Bird for a past vote opposing measures limiting cooperation between local law enforcement and Immigration and Customs Enforcement (ICE). Republicans have sought to portray Rutinel as a radical, pointing to his past support for progressive issues and past rallies with New York City Mayor Zohran Mamdani.

Additionally, incumbent Sen. John Hickenlooper secured the Democratic nomination for his Senate seat, narrowly defeating progressive former State Sen. Julie Gonzales. Gonzales, a former DSA member, stated that her campaign put "the Democratic establishment on notice."

In the race for governor, Attorney General Phil Weiser defeated U.S. Sen. Michael Bennet for the Democratic nomination. Weiser ran to Bennet's left on certain issues and highlighted his past efforts to challenge the Trump administration.

Democratic strategist Joe Caiazzo noted that "it is undeniable that progressives have built a coalition and have a message that can serve to buoy a candidate when they are an acceptable alternative to the status quo."

While mainstream Democrats have won many primaries, the successes of far-left candidates are drawing significant media attention. Republicans have used these outcomes to portray the broader Democratic Party as radical, potentially impacting their chances in general elections, particularly in competitive districts.