A large crowd forms near a stage where President Barack Obama will speak and then take a symbolic walk across the Edmund Pettus Bridge, Saturday, March 7, 2015, in Selma, Ala. This weekend marks the 50th anniversary of "Bloody Sunday,' a civil rights march in which protestors were beaten, trampled and tear-gassed by police at the Edmund Pettus Bridge, in Selma. (AP Photo/Gerald Herbert)
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