Historical documentary: 'The Right to Vote'

President Obama hugs Rep. John Lewis
US President Barack Obama (R) hugs US Representative John Lewis, Democrat of Georgia, one of the original marchers at Selma, during an event marking the 50th Anniversary of the Selma to Montgomery civil rights marches at the Edmund Pettus Bridge in Selma, Alabama, March 7, 2015. The Obamas traveled to Selma to commemorate Bloody Sunday, when civil rights marchers attempting to walk to the Alabama capital of Montgomery to end voting discrimination against African Americans, clashed with police on the Edmund Pettus Bridge.