He needs a Mam-date. Zohran Mamdani’s allies with the city’s Democratic Socialists of America called for a “show of force” at the ballot box Wednesday to help the mayoral front-runner enact his far-left agenda. New York City DSA’s co-chairs Grace Mausser and Gustavo Gordillo conceded on the “Max Politics” podcast that Mamdani needs 50% of…