Photo-Illustration: Joe Darrow; Photos: Getty Images Before launching in early July what he promised would be an all-out effort, one he would see “through the end, to the final day,” to keep Zohran Mamdani from winning the mayor’s office, Republican political megadonor John Catsimatidis had a phone call with the Democratic nominee himself. “I said to him, ‘Look, you’re a very nice guy and, you know, a very smart guy,’” the 76-year-old billionaire owner of the Gristedes supermarket chain told me.