He should just call a presser, address the charges as baseless false and affirm that the campaign moves on.
Just ignore the media and campaign. They are dunces and they will move on to the next GOP hit job soon.
This is one instance where he needs a professional staff. But then again, it is the lean and mean staff that got him to be the leader.
Address a last time and end it. Let the media speculate. Nobody trusts the media that will vote for Cain anyway.
...and then (a la Mark Block) and taking a cue from Rush Limbaugh, while still at the podium, start blazing away on a Cohiba...and smiling!
May be Cain is milking this story by getting absolutely free publicity, and when nothing comes out of it, he will come out of it smelling like roses. I hope he is really that Machiavellian!!!