Democratic socialist candidates swept key primary races in New York Tuesday, accelerating their rise within the Democratic Party while more traditional center-left candidates and moderates backed by corporate interests prevailed in other contests. Results of primaries across four states Tuesday cemented the growing influence of New York Mayor Zohran Mamdani’s brand of progressive populism while demonstrating its potential limits outside of large East Coast cities.

New York City voters nominated three left-wing U.S. House candidates endorsed by Mamdani, boosting his clout as a political kingmaker and ousting two incumbents in the process.