Republican voters are coalescing behind [Donald] Trump, but many Republican elected officials still say they can't support him.

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

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

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

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

If [Donald] Trump loses narrowly, it will make it much harder for the GOP to unify. Under that scenario, the Trumpists are likely to argue that the election was lost because the Republican establishment failed to rally around the choice their own voters made.

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.