Mitt Romney got 59 percent of the white vote in 2012, considered by many to be a high-water mark with this demographic group. Can [Donald] Trump win a higher share of white voters than Romney and get more of them to turn out?

Obama's even keel sometimes comes across as aloof or even cold.

As those states and others in the South and West become more diverse and educated, they will become harder for the Republican Party - in its current form - to win.

Well, we had a bunch of primaries and caucuses on the Democratic side. Bernie Sanders won the Nebraska and Kansas caucuses. That keeps his campaign alive. But Hillary Clinton won Louisiana, which was the big prize of the night, so she ended up winning more delegates than he did yesterday.

There's a lot of anxiety about terrorism among the country at large. There's also a feeling the country has stagnated.

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.

Does Donald Trump accept the results and concede graciously, pursue legal action, or tell his followers to take to the streets?