15 of 22: Senate Chaplain Barry Black leads Congressional staff members and others in prayer at the "Hoodies on the Hill" gathering on Capitol Hill in Washington, Friday, March 23, 2012 to remember Trayvon Martin, the unarmed black teenager who was shot in Sanford, Fla., as he was wearing a hooded sweatshirt. (AP Photo/J. Scott Applewhite)

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