Isaac bears down on Florida Keys
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Credit: Getty Images
MARATHON, FL - AUGUST 26: A man rides his bike along Overseas Highway as Tropical Storm Isaac begins to move toward the Florida Keys on August 26, 2012 in Islamorada, Florida. According to reports, Isaac has become stronger as it moves toward the Florida Keys and forecasters say it could strengthen into a Category 2 storm. (Photo by Marc Serota/Getty Images)
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