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

People like Ted Cruz, who has tried to position himself as the best second choice for [Donald] Trump supporters, wouldn't condemn him.

The [Hillary] Clinton campaign's recent travel schedule shows how seriously it takes this problem. She and her surrogates have held rallies in cities like Philadelphia, Detroit and Cleveland, trying to boost turnout among African-Americans.

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

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?

If [Donald] Trump wins narrowly, Democrats can blame the loss on FBI director James Comey, who inserted himself late in the campaign in an unprecedented way.

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