JU Poll: Donald Trump leads, Carly Fiorina and Marco Rubio rise, Jeb Bush steady

Donald Trump remains the front-runner among Republican presidential candidates in Florida, with former Florida Gov. Jeb Bush maintaining strong support, former Hewlett-Packard CEO Carly Fiorina surging, neurosurgeon Ben Carson losing some ground and U.S. Sen. Marco Rubio on the rise, according to a Jacksonville University Public Policy Institute poll of registered Republican likely voters released today. The Jacksonville University PPI Poll, conducted from Sept. 17-22, shows a major shakeup in Florida, with five candidates polling in double digits in a tightening…