Potential U.S. Republican 2016 contenders spar over Cuba policy

By Gabriel Debenedetti WASHINGTON (Reuters) - Neither is officially running for president yet, but potential Republican 2016 presidential candidates Rand Paul and Marco Rubio have trading barbs about Cuba in what were the opening shots of an intraparty fight over U.S. policy toward Havana. Rubio, a Cuban-American freshman senator from Florida, has become the face of Republican opposition to the White House's plan to normalize relations with Cuba. Paul, a Kentucky senator who has fought to s