Indeed, but Cameron got his information not from him but from McCain insiders. This was verified by John Gibson in an email to one of our FR members. I'll hunt up a link to the FR post and get back to you.
To: unspunIt is possible that the hoaxer is a liar and there really is an unnamed Palin backstabber in the McCain campaign? I emailed John Gibson during his radio show saying that Carl Cameron's unnamed source was a hoaxer. He sent me an interesting email."bloom, sorry again. i read your link. someone is bragging beyond their actual accomplishments. my son is carl's producer and i know for a fact nobody leaked anything to him, because he said the story was all carl. i do know who was talking to carl and that source is literally unimpeachable. hey look, i like her too, but this episode has just shown that she should do her homework and she'll be back in a couple years this whole dustup forgotten. jg"
If this is true, then the real source in the McCain campaign is still unknown.