The Democrats support Fascist commiting genocide in Palestine.
Did you follow any of the primary debates? How all the other DNC candidates sucked up to Israel how they would go there first? How the Zionist lobby rabidly spouted accusations of Antisemitism against Mamdani?
If Harris/Biden,who declared themselves loyal Zionists had won, these campaigns would have hit even stronger.
It is the fact that people understood the genocidial status quo of the party has to end, that gave Mamdani the momentum.