US President Barack Obama (7L), First Lady Michelle Obama (5L), former US President George W. Bush (5R), Laura Bush (6R) and US Representative John Lewis (6L), Democrat of Georgia and one of the original marchers, lead a walk across the Edmund Pettus Bridge to mark the 50th Anniversary of the Selma to Montgomery civil rights marches in Selma, Alabama, on March 7, 2015. US President Barack Obama rallied a new generation of Americans to the spirit of the civil rights struggle, warning their march for freedom "is not yet finished." In a forceful speech in Selma, Alabama on the 50th anniversary of the brutal repression of a peaceful protest, America's first black president denounced new attempts to restrict voting rights. AFP PHOTO/ SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
