On "Bloody Sunday," John Lewis and other civil rights marchers were brutally attacked by police and soldiers on the Edmund Pettus Bridge in Selma, Alabama.
Tomorrow — just 50 years later -- President Obama and former President George W. Bush will be among the huge crowd that's expected to attend the "Bridge Crossing Jubilee" in Selma. It's a reminder of progress toward civil rights in America — and a reminder of failure. Peniel Joseph is a history professor at Tufts University, where he directs the Center for the Study of Race and Democracy. He's author of, Stokely: A Life, about the disillusioned civil rights leader, Stokely Carmichael.