Rep. Adriano Espaillat, a five-term Democratic congressman and chair of the Congressional Hispanic Caucus, lost his primary in New York's 13th district to Darializa Avila Chevalier, a democratic socialist community organizer backed by Mayor Zohran Mamdani. This marks a significant win for New York's progressive wing and shows the ongoing shift within urban Democratic primaries toward younger, more left-wing challengers. Espaillat was a prominent establishment Democrat — his loss signals declining support for moderate incumbents in progressive-leaning districts and highlights the influence Mayor Mamdani wields in city politics.