WASHINGTON (AP) — President Donald Trump gazes out over his rally crowd and lets loose a stream of insults with a theatrical flourish and playful grin. He jabs at Cory Booker the "disaster" mayor, Elizabeth Warren the "Pocahontas" pretender and "sleepy" Joe Biden.

"I want to be careful," Trump tells the crowd, feigning a confession. He doesn't want to hit his potential challengers too badly, he says, because then the Democrats may find "somebody that's actually good to run against me. That would not be good."

The venue may be Council Bluffs, Iowa, or Erie, Pennsylvania, or Topeka, Kansas, but...