WASHINGTON - A federal plan to prevent a major exodus of Cuban refugees following Fidel Castro's death appears sound, two Florida congressmen said Wednesday. "Operationally, they're as prepared as they can be at this stage," said Rep. John Mica, R-Fla., after a closed-door briefing with leaders from half a dozen federal agencies prepping for the passing of the ailing Cuban dictator...Emergency planners fear the post-Castro political climate could prompt the largest mass migration to Florida in decades... Diaz-Balart said the agencies "made very clear" that they intend to prevent a post-Castro wave of migrants from reaching U.S. soil. "It will...