The GOP establishment, in particular, is facing a pick-your-poison kind of decision. Many establishment Republicans dislike [Ted] Cruz personally. He has no Senate endorsements.

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.

The winner's margin of victory also matters. If it's a squeaker, that will make the lessons learned for both parties much murkier.

The establishment is divorcing itself from its base - from voters who are choosing a candidate who says he stands for things that are anathema to the establishment.

If [Hillary] Clinton can't boost African-American turnout, even with all that help, the question becomes whether she can make up for it with historic levels of support from Hispanics and suburban women.

For Democrats, anything less than 15 net pickups will be a disappointing outcome [in presidency race].

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