Nearly half a century ago, in a very different America, Elwin Wilson and John Lewis met under a veil of violence and race-inspired hate. Wilson, a young, white, Southern man, attacked Lewis, a freedom rider for Martin Luther King, in the white" waiting room of a South Carolina bus station. The men had not seen each other again until Tuesday when, with "Good Morning America's" help, Wilson approached Lewis again -- this time offering an apology and a chance to relieve a burden he'd carried for more than four decades. "I'm so sorry about what happened back then," Wilson said breathlessly. "It's OK. I forgive you," Lewis responded before a long-awaited hug. For Lewis, who in the intervening years became a U.S. representative from Georgia, the apology was an unexpected symbol of the change in time and hearts. "I never thought this would happen," he told "GMA." "It says something about the power of love, of grace, the power of the people being able to say, 'I'm sorry,' and move on. And I deeply appreciate it. It's very meaningful for me." The change, one Wilson said was a long time coming, was sparked by Barack Obama's presidential victory. "I like Barack Obama," he said. "I didn't vote for him, but I'm glad he's there, and I've prayed for him."

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