Obama revisits the fear of demographic change.

Latest Republican debate boosted Trump, ISIS and anxiety.

Big donors are complaining about their bad investments in presidential politics.

Outrageous statements can become ends in themselves.

The president can't cross divide on perceptions of threat from ISIS.

Anti-government voters have driven the shift against gun control.

The U.S. is divided over whether things are O.K. or terrible.

Americans don't trust each other, and they trust the government even less

The Republican frontrunner benefits from resentment against the media.

Claiming the political center works, at least when scandal lends a hand.