David Gergen: “I think what's really interesting is Sarah Palin is not going on the side of the more conservative challenger but is…”

I think a lot of Americans do see it as disqualifying. And they're worried about it.

If he had a receptive audience, and I will tell you, when everything -- when all the facts were to come out, it would be like Nixon and the tapes.

I don't think Trump is out of the woods, even though his poll numbers are not only staying up, they have actually been strengthened some.

If he comes out and throws cold water on this, then I don't think it goes anywhere.