Isaac heads for Hispaniola, could threaten Florida

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Two men look out at the beach in Barahona, Dominican Republic, Thursday, Aug. 23, 2012. Puerto Rico and the U.S. Virgin Islands braced for torrential rains on Thursday as Tropical Storm Isaac whipped up waves as high as 10 feet (3 meters) in the Caribbean and threatened to become a hurricane that could take a shot at Florida just as Republicans gather for their national convention. (AP Photo/Ricardo Arduengo)Tropical Storm Isaac churned toward the Dominican Republic and Haiti on Thursday, threatening to strengthen into a hurricane that could take a shot at Florida just as the Republicans gather for their national convention.