As Jeralyn notes, Obama just attacked John Edwards. I guess he is a pol after all. Politico's Ben Smith reports:

"I don't just talk the talk, I walk the walk, I've been doing this all my life, and John has not had that same record," he said.

"John yesterday said that he didn't believe in 527s," he said. "We found out today that there's an outside group spending $750,000...and the individual who's running the group used to be John Edwards' campaign manager."

"You can't say yesterday you don't believe in them and today you're having three quarters of a million dollars being spent for you," he said.

Does this mean Edwards is eating into Obama's vote? Seems likely as otherwise pols don't notice their opponents. Hillary used the same trick when she was ahead and then attacked when she was being challenged. Oh and of course Edwards was the first to go really negative.

As I say, pols are pols, they do what they do.