DSA-aligned challengers crushed establishment Democrats across New York, a big win for the party's left wing and a warning to its old guard.

• Candidates backed by Zohran Mamdani won a slate of federal and state races, ousting two Democratic incumbents in New York City.
• Daria Lisa Avila Chevier, a first-time candidate and former Columbia protest organizer, knocked off Adriano Espaillat, the powerful chair of the Progressive Caucus.
• Brad Lander beat incumbent Dan Goldman by more than 30 points, and Claire Valdez won her open seat by about 20.
• Israel and Gaza were a dividing line in several races, with the more anti-establishment, pro-Palestinian candidates winning.
• The shift went beyond the city: around a dozen Democratic incumbents across New York and Maryland lost to challengers on the left.

Outlook: Expect a louder fight over the direction of the Democratic Party as its progressive wing presses its momentum into more primaries.