Sen. Marco Rubio of Florida, the quintessential young man in a hurry and son of working-class Cuban refugees, kicked off an ambitious campaign for the 2016 GOP presidential nomination Monday night with a call for a “new American century." He may find it difficult, though, to keep up with Bush, Wisconsin Gov. Scott Walker, Cruz and others in raising campaign funds. Even so, University of Virginia political scientist Larry J. Sabato said Rubio has “plenty of potential, from charisma and many conservative views that the base will like, to his ability to at least get a hearing fro...