When Republican Jeb Bush gathered donors in Miami for an April retreat, it was clear he planned a less-scripted, more-inclusive U.S. presidential campaign bearing little resemblance to that of the unsuccessful 2012 nominee Mitt Romney.

"Let Jeb be Jeb" was the message Bush's advisers conveyed.

A former Florida governor, Bush will launch his campaign for the November 2016 election in Miami on Monday, having built a well-funded organization but facing some of the same dilemmas that Romney faced.