I think that the woman is a lobbyist is the part that surprises me more, he always made such a big deal about not dealing with lobbyists. Then again, it does support my maxim: If a Republican is complaining about something, odds are he's doing it himself (or herself).
So will this lead to Republican Nominee Huckabee? Will Romney get back in the race? Will McCain still be the nominee? I'm thinking the last one. And I'd far prefer the Democrats to repeatedly mention Keating if they're going to go after him.
EDIT: One truly amusing aspect of this is that the Republicans had all been arguing over who was the most like Reagan (back when there was still something of a race for the Republican nomination). McCain was clearly the leader as he'd been married, cheated on his wife and then married the woman he was cheating with. That's exactly how Ronnie ended up with Nancy.