NICK GILLESPIE: Bill de Blasio’s first priority as New York City’s leader is to ban horse-drawn carriages in Central Park. Are you kidding? “If historians debate whether Caligula’s apocryphal attempt to make his horse a consul of Rome signified serious mental illness or was just the emperor’s idea of a joke, contemporary New Yorkers should have no doubt that their new mayor, Bill de Blasio, is nuttier than a squirrel’s turd.”