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President Barack Obama, first lady Michelle Obama, Malia and Sasha as well as members of Congress and civil rights leaders make 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. President Barack Obama, center, walks as he holds hands with Amelia Boynton, right, who was beaten during "Bloody Sunday," and Rep. John Lewis, D-Ga, at left. From front left are Malia Obama, Marian Robinson, Sasha Obama, first lady Michelle Obama, Lewis Obama, Boynton and Adelaide Sanford, also in wheelchair. (AP Photo/Jacquelyn Martin)