Vermont Sen. Bernie Sanders said Wednesday he’ll campaign actively this fall to send Democrat Hillary Clinton to the White House and bolster the party’s congressional candidates, with swings already planned in New Hampshire, New York and Washington state. And while he has policy disagreements with Clinton, Sanders urged those who backed his defeated bid for the Democratic presidential nomination to not defect to the Green Party’s Jill Stein or Libertarian Gary Johnson. “Politics is tough stuff, and you’ve got to make difficult choices,” Sanders, an independent, said in an interview with The Associated Press. “To me, this was not a...