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Craig Jones, left, and Kimberly Branson secure their boat in Key West, Fla., Sunday, Aug. 26, 2012 in preparation for Tropical Storm Isaac. Tropical Storm Isaac gained fresh muscle Sunday as it bore down on the Florida Keys, with forecasters warning it could grow into a dangerous Category 2 hurricane as it nears the northern Gulf Coast. (AP Photo/Alan Diaz) ORG XMIT: FLAD101