night, remembering that day 50 years ago that became known as bloody Sunday. So many in Selma remembering the marchers, and the legacy they leave behind. Steve osunsami in Selma. Reporter: At the church where the March began. Many lined up, the church too full to get in. The country's top law enforcement officer stepped up to the pulpit. We have more work to do. Our society is not yet at a just peace. We will March on. Reporter: Eric holder preaching about the issue that led to that bloody Sunday in 1965. The obstacles that keep black voters from the polls. Among families we spoke with today, a vigorous discussion. Sometimes the obstacles are ourselves. We have to educate the communities about voting. And really connect the dots in a real way. A lot of them don't get it. Reporter: The people were not physically imposing, but gave courage to millions. They held no elected office. But they led the nation. They marched as Americans that had endured hundreds of years of brutal violence. They didn't seek special treatment. Just the equal treatment promised to them almost a century before. Reporter: Congressman John lewis had his skull nearly broken. There's still work left to be done. Get out there and push and pull until we redeem the soul of America. Reporter: He said the weather today in Selma was much better than 50 years ago. Not so much of a chill in the air. Steve osunsami, ABC news, sell 345. Thank you for watching. "Gma" first thing in the morning. David Muir will be back tomorrow