Diana DeGette

Melat Kiros was fresh out of Notre Dame Law School in 2023 when she was fired by her New York law firm after publishing a lengthy letter sharply criticizing Israel’s government, raising questions about its historical legitimacy and challenging the firm’s response to law students engaging in pro-Palestinian activism.

In Tuesday’s Democratic primary in Colorado, under the banner of the Democratic Socialists of America, Ms. Kiros, 29, is again challenging the establishment. This time, she hopes to defeat Representative Diana DeGette, 68, a liberal Democrat who was elected to her Denver-area seat a year before Ms. Kiros was born.

The showdown is the latest between the mainstream Democratic Party and its ascendant, youthful left wing, but Ms. Kiros represents more than the D.S.A. She is one of several Gen Z candidates this year fueled by the generational frustrations of their pandemic-marred youth, social media-fueled isolation, artificial intelligence and the war in Gaza.

The upset pulled off by Darializa Avila Chevalier, 32, a socialist doctoral student, over Representative Adriano Espaillat, 71, in last week’s New York Democratic primary may have only set the stage for the generational and ideological fights to come — on both sides of the political aisle.

“When you’re living through these kinds of moments on such a regular basis, it feels impossible to be able to change course and believe your vote actually makes a difference,” Ms. Kiros said.

But, she added, “we’re seeing just how broken the system is, and we’re seeing that no one’s coming to save us but us.”

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