NEW YORK — When Mayor Zohran Mamdani endorsed former city Comptroller Brad Lander’s run against Rep. Dan Goldman, many Democrats accepted it as a favor to a political ally — even if it came at the expense of bucking an incumbent.

But each successive endorsement has created new friction that has led some Democrats to question whether the mayor keeps his political commitments.

When he backed Assemblymember Claire Valdez for retiring Rep. Nydia Velázquez’s seat, Democratic power brokers weren’t as understanding, with even progressives openly grousing about how Mamdani spurned Velázquez’s succession plan by opting for a fellow democratic socialist…

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