Early voting begins Saturday in New York's competitive primary elections, with nine days of voting leading up to Primary Day on June 23. The contests span congressional districts across New York City and upstate, featuring several closely watched matchups that could reshape the Democratic landscape ahead of November's midterm elections.

Mayor Zohran Mamdani has thrown his support behind progressive candidates challenging establishment figures, including former city comptroller Brad Lander taking on two-term Representative Dan Goldman in the 10th District. The race has centered on Israel policy, with Lander's supporters criticizing Goldman's AIPAC ties. Mamdani also endorsed Darializa Avila Chevalier over five-term incumbent Adriano Espaillat in the 13th District.

Other notable contests include Jack Schlossberg, a Kennedy heir, competing for Manhattan's 12th District seat vacated by Jerrold Nadler, and a bitter Republican primary in upstate's 21st District to replace Elise Stefanik. State voters will also decide the comptroller race, where longtime incumbent Thomas P. DiNapoli faces left-leaning challengers.

New York operates as a closed primary state, restricting voting to registered party members only. Early voting sites differ from Primary Day locations, with polls opening at various times through June 21. These contests will determine the Democratic candidates who are virtually assured victory in November given the party's dominance in these districts.