David Gergen: “I believe for some time that right from the beginning the Democrats could have played this differently and should have.”

I think the turning point that came were the midterm elections. The fever broke with those midterm elections. And what we've seen since then is a steady decline in Trump's credibility and in his position with the American people, and a…

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

You can't out-Nixon Nixon very easily, but Donald Trump has.

The midterms really helped him. They transformed the race, best midterm elections for any president in 20 years.