New York City Mayor Zohran Mamdani said Sunday that he and his endorsed Democratic socialist candidates who won recent primary contests are carrying a “national message” to working Americans who are struggling to make ends meet, framing the electoral gains as part of a broader shift in the Democratic Party’s direction.

Mamdani’s endorsed candidates won Democratic nominations in three U.S. House races and five state legislature races in Albany during New York’s primaries in recent weeks, a sweep that the mayor described as evidence of a hunger for a different kind of politics “coast to coast.”

“We don’t have to nationalize that message,” Mamdani said. “That is a national message — it’s a national crisis.”

The mayor characterized the coalition’s political philosophy as grounded in a “New Deal understanding” of Democratic governance, saying it speaks to Americans who are feeling the exhaustion of trying to make ends meet “every single day.”

Fifteen self-described moderate Democrats in the U.S. House responded with a joint open letter that, while not naming Mamdani or his endorsed candidates, was aimed squarely at the socialist platform.

“We are capitalist, not socialist,” the letter stated. “We are mainstream, not extreme. We are proud, not ashamed, of America.”

Mamdani, a 34-year-old democratic socialist who took office as mayor in January, has used his political platform to boost like-minded candidates and hosted a rally with U.S. Sen. Bernie Sanders, where he called for what the Guardian described as “sweeping change in the Democratic Party.”