In the New York Democratic primaries held on June 23, 2026, candidates backed by Mayor Zohran Mamdani achieved significant victories. Former New York City Comptroller Brad Lander won the Democratic primary for New York’s 10th District, receiving approximately two-thirds of the vote against incumbent Rep. Dan Goldman. State legislator Claire Valdez also secured a win in the 7th District, defeating Brooklyn Borough President Antonio Reynoso, who had the support of retiring Rep. Nydia Velázquez. Valdez campaigned on issues such as 'Medicare for All' and housing reforms, emphasizing her stance on Israel's actions in the ongoing conflict with Hamas.
Additionally, Darializa Avila Chevalier, another candidate endorsed by Mamdani, defeated 10-year incumbent Adriano Espaillat. The campaigns were marked by intense competition and discussions surrounding Israel policy, with all three Mamdani-backed candidates criticizing Israel's conduct during the conflict. The primaries were influenced by significant funding from super PACs associated with various interests, including the artificial intelligence sector and pro-Israel groups. Mamdani's endorsements and active campaigning for these candidates were seen as pivotal in their successes, reflecting a broader movement within the Democratic Party toward progressive and socialist ideals.