Three progressive candidates endorsed by Mamdani won their June 2026 primaries: Brad Lander, Darializa Avila Chevalier, and Claire Valdez. They each won Democratic House nominations in New York, with Lander and Chevalier unseating incumbents and Valdez winning an open seat.

Quick Scoop

  • Brad Lander beat Rep. Dan Goldman in New York’s 10th District.
  • Darializa Avila Chevalier defeated Rep. Adriano Espaillat in New York’s 13th District.
  • Claire Valdez won the Democratic primary in New York’s 7th District.

What happened

The reporting describes it as a clean sweep for Mamdani’s endorsed slate, and multiple outlets say all three backed candidates won their primaries in New York on June 23–24, 2026. Two of the victories were especially notable because they knocked out sitting members of Congress.

In one line

Mamdani’s June 2026 primary winners were Lander, Avila Chevalier, and Valdez.