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SELMA, AL - MARCH 4:  Democratic Presidential candidate Senator Barack Obama (D-IL) (3rd-L) marches with a crowd to the Edmund Pettus Bridge to commemorate the 1965 Bloody Sunday Voting Rights March March 4, 2007 in Selma, Alabama. During the 1965 march, which was to go from Selma to Montgomery, Alabama, police used tear gas and beat back the marchers when they reached the Pettus Bridge.  (Photo by Scott Olson/Getty Images)
SELMA, AL - MARCH 4:  Democratic Presidential candidate Senator Barack Obama (D-IL) (3rd-L) marches with a crowd to the Edmund Pettus Bridge to commemorate the 1965 Bloody Sunday Voting Rights March March 4, 2007 in Selma, Alabama. During the 1965 march, which was to go from Selma to Montgomery, Alabama, police used tear gas and beat back the marchers when they reached the Pettus Bridge.  (Photo by Scott Olson/Getty Images)

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John King, Olivier Knox and Margaret Talev on race relations in the U.S. ahead of the Selma anniversary and the event's lack of Republican representation.

Politics of the Selma anniversary

John King, Olivier Knox and Margaret Talev on race relations in the U.S. ahead of the Selma anniversary and the event's lack of Republican representation.