I didn’t follow Cain closely, but:
-didn’t we learn that he had a roving eye at the least?
-didn’t he drop out?
Cain dropped out for loaning a friend money without telling his wife. At the time, he also stated to followers that the death threats on his grandchildren made it not worth continuing. There was nothing in the way of proof. I wish he had sued for slander. Had he been vindicated, it would have crippled this tactic.