Republicans think that [Ted] Cruz would be like Barry Goldwater. He'd lose in a landslide and pull the party down with him. They'd lose Senate and House seats.

As one person said to me , Republicans know [Donald] Trump is a stain on their party.

After months and months at the top of the polls, there is a real possibility that Donald Trump could be the nominee.

Meanwhile, there are some traditional battleground states - like Ohio and Iowa - that are becoming older, whiter and less educated. That's turning them from true battlegrounds into more reliable red states.

I think that's why we see this mixed reaction - Republican congressional leaders like Paul Ryan speaking out very firmly, but Republican candidates not as much, with the exception of the candidates in the single digits like Jeb Bush or Lindsey Graham, who said how to make America great again tell - Donald Trump to go to hell.

[Hillary] Clinton has also struggled with key groups of voters.

Republicans like Trent Lott, saying [Donald] Trump would be more flexible [then Ted Cruz].