In 2012, Hispanics were 10 percent of the electorate, underperforming their share of the voting-age population. Mitt Romney got 21 percent of their vote, and [Donald] Trump has been polling much lower than that.

On the other side, you have the conservative intelligentsia - magazines like National Review, which has a big anti-Trump issue; Weekly Standard editor, conservative talk show hosts - they're mounting a big anti-Trump effort, pro-Cruz effort because they think [Donald] Trump is dangerous and he's not qualified to be commander in chief.

The Republican Party, right now, is a conservative populist party.

Romney still enjoys the Republicans' traditional advantage among voters who are veterans, but the Obama campaign is confident it can chip away at that.

If Pat Toomey of Pennsylvania wins, for instance, it will tell Republicans that their own brand hasn't been hurt too badly by [Donald] Trump's negatives.

As one conservative intellectual said to me - he said if the choice is between [Joseph] Stalin and [Adolf] Hitler, I'd pick Stalin, meaning Ted Cruz because he's more predictable. So there's real civil war inside the Republican Party.

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