NYC mayor candidate Yang back campaigning after kidney stone April 3, 2021 FacebookTwitterEmail FILE - In this March 11, 2021 file photo, Democratic mayoral candidate Andrew Yang holds a news conference in the Dumbo neighborhood of New York. Yang has resumed campaigning a day after going to the hospital for a kidney stone. Yang’s campaign said Saturday, April 3, that he planned to visit an Easter egg hunt at the Queens County Farm and meet with campaign volunteers at Open Streets locations in Brooklyn.Mark Lennihan/AP NEW YORK (AP) — New York City mayoral candidate Andrew Yang has resumed campaigning a day after going to the hospital for a kidney stone.