The question remains as to whether or not this lobbyist scandal could go far enough to be a gift to Huckabee, or even Romney.  McCain's rebuttal to the NY Times article suggesting he had an affair appears to be outright false.  McCain claims he never spoke with anyone at Paxson Communications or their lobbying firm (where Vicki Iseman, the woman named in the possible affair works) about two letters he wrote to the FCC on their behalf.  A sworn deposition from 5 years ago has him on record claiming that he did speak with them and was asked to write the letters. Blah, blah, blah -- another DC scandal, but this line from his deposition is the key

A Hole in McCain’s Defense? | Newsweek
At another point Abrams asked McCain if, "looking back on the events with Mr. Paxson, the contributions, the jets, everything you and I have just talked about, do you believe that it would have been justified for a member of the public to say there is at least an appearance of corruption here?"

"Absolutely," McCain replied. "And when I took a thousand dollars or any other hard-money contribution from anybody who does business before the Congress of the United States, then that allegation is justified as well. Because the taint affects all of us." Elsewhere McCain said about his dealings with Paxson, "As I said before, I believe that there could possibly be an appearance of corruption because this system has tainted all of us."

That is Obama's response to questions from Hill-bot or McCain about his lack of DC experience. Let's all make, "This system has tainted all of us" t-shirts. Hell, I'll crochet it on a pillow and send it to McCain.