A new poll finds Donald Trump leading Jeb Bush and Sen. Marco Rubio — in their home state of Florida. The surprise result comes less than a week after another poll found Bush, the state’s former governor, with a comfortable 12-point lead over Rubio, a GOP senator from the Sunshine state. Trump was 17 points behind Bush in the Maxon-Dixon poll released on Friday. The new poll, by Florida-based St. Pete Polls, was released on Wednesday and found Trump leading the entire field at 26 percent—6 points ahead of Bush. Conventional wisdom has been that Florida will be dominated by...