Gleeful Republicans will make socialist Democratic mayoral nominee Zohran Mamdani a key campaign issue as they pound “Mamdani Democrats” running for election across the state, party insiders said. GOP officials will tie Mamdani to Democrat candidates from Long Island to upstate, with the idea the party will answer for the nomination in more moderate areas such as Staten Island, Nassau and Suffolk — and even places like Binghamton, The Post has learned. “If there was ever any doubt that our city is headed in the wrong direction, this past Democratic mayoral primary election gave people their answer,” Staten Island Republican...