The New York Post reported that the United Federation of Teachers in New York City — the largest local union in the AFT — did not endorse any Democrat in the mayoral primary race. "Mamdani has no experience in city government," Casey said. "I was explaining my primary vote & why I ranked Brad Lander above Mamdani," Casey wrote. "I was clear that I would strongly support Mamdani if he won the primary." "The thread has nothing to do with my union or Randi, both of whom support Mamdani," he added.