By David Shribman - August 23, 2015

EXETER, N.H. — There was a man with a “Stop Puppy Mills” T-shirt and another whose shirt read “National Sarcasm Society.” There was a woman, dressed entirely in white, holding a banner reading “Lead Us to Clean Energy.” There was a man with an Apache haircut. There was even a little old lady in tennis shoes. This could only be a Bernie Sanders rally. And...