A number of recent high-profile congressional primaries in the Democratic Party have resulted in the nomination of unexpected candidates. Many of these winning candidates have unseated entrenched incumbents, as 29-year-old Colorado attorney Melat Kiros did to U.S. Rep. Diana DeGette, who has been serving in the House for three decades.

Some of these candidates are explicitly running under the banner of the Democratic Socialists of America, known as the “DSA,” a far-left organization known for standard-bearers such as U.S. Sen. Bernie Sanders of Vermont, and U.S. Rep. Alexandria Ocasio-Cortez of New York. New York City’s charismatic mayor, Zohran Mamdani, won his election as a DSA member in 2025 and has since marshaled political support for fellow progressives running for other offices in the city he runs.

Mamdani loaned his star power to three New York progressives, two of them DSA members, in an ad featuring promises to “abolish ICE” and “end corporate greed.” All three went on win their congressional primaries in June 2026.

There is no doubt that the DSA is having a moment within the Democratic Party. And since their candidates in the midterm races are all but guaranteed to win their safely Democratic districts, I believe their influence is likely to be a major factor on Capitol Hill in the next Congress.

That’s especially the case if the Democrats win the House with a narrow margin. The cooperation and votes of a handful of DSA members could be crucial to Democrats’ ability to act effectively as a majority – or not.

That’s because the DSA’s far-left positions on issues such as healthcare in the form of Medicare for All, defunding the police and taxing the ultrawealthy are likely to divide the Democrats, many of whom are more moderate and/or represent conservative districts.

But as a political scientist who studies the many methods politicians have available to represent their constituents, I’m seeing a story that’s more complex than many inside or outside the Democratic Party convey.

Affiliation with the DSA, or even just a far-left ideology,........

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