I don’t think he was just pulling it out of his a$$. There have been many reports from different legitimate sites saying it’s the Romney folks.
Yeah, I've seen these "reports", which are second-hand rumors of dark whispers from Romney acolytes (which is what exactly?). No quotes from Romney, nay, not even quotes from these acolytes, who are no longer working for Romney, whose campaign long ago ended.
I've supported Romney at FR. Am I an acolyte? I think Palin is great, was a boost to the campaign (probably better than Mitt would been) but would have been even greater if she had greater interviewing prowess. There, now you've got equivocal-about-Sarah quote from a Romney acolyte! You are no longer reliant on rumors from reputable web sites. Have at it.