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Demonstrators hold signs aloft as they march during an NAACP march and rally to the front of the Sanford Police Department for Trayvon Martin in Sanford, Florida, March 31, 2012 (Credit: Reuters/Lucas Jackson)

Demonstrators hold signs aloft as they march during an NAACP march and rally to the front of the Sanford Police Department for Trayvon Martin in Sanford, Florida, March 31, 2012 (Credit: Reuters/Lucas Jackson)