Imho, Cain would have been busy with much more than a claim such as that, in which he believed himself to be innocent.
I said whether he knew about the particulars or not, he sure knew about the complaint.
It comes out now that his campaign knew this was coming for ten days after Politco contacted them about it. Pee poor damage control by Cain and his team. They should have been out front, held a news conference, laid out their version of story as known by them and preempted the story early on.