Brad Lander, the New York City comptroller, has announced his campaign to challenge Representative Daniel Goldman in a closely watched Democratic primary. Lander, who is supported by Mayor-elect Zohran Mamdani and several prominent progressive leaders, aims to unite the district's left-leaning voters and provide a stronger voice on issues such as immigrant rights and opposition to Donald Trump. The race highlights deep divisions within the party, particularly over positions on Israel and the war in Gaza, with Lander positioning himself as a critic of Israel's actions and Goldman maintaining a more moderate stance. The contest is part of a broader wave of competitive primaries across New York, as progressives seek to consolidate support and challenge the Democratic establishment.