You have to ask?
It seems unrealistic to expect our politicians to have never sinned, even to have never committed sexual wrongdoings. Here are some examples in addition to Cleveland and Harding:
Jefferson (children with Sally Hemmings, not absolutely proved, but there is plenty of evidence), FDR (his mistress was with him when he died), Eisenhower (Kay Sommersby), Kennedy (fillandering well established), LBJ (well established), Nixon (no known sexual wrongdoing, but plenty of sinning), Carter (same as Nixon as far as sex, but he ‘sinned in his heart’), Reagan (divorced, Patti Reagan Davis apparently conceived before marriage to Nancy Davis), Clinton (goes without saying), GW Bush (alcoholic, apparently former playboy). Truman and GHW Bush: can’t think of anything specific, but must have sinned some time,
If we demand that our politicians should be totally pure, we won’t find anyone who can meet that criterion.