"One thing that I'd just remind young people of is that when John Lewis, who's a member of Congress today, defied George Wallace and led the march from Selma to Montgomery, he was 23 years old. Martin Luther King was the old man in the bunch, and he was 35, so young people need to know that they've always been an important part of our society, have always been at the forefront of pushing for a more just America, and we can't be successful without the impatience, the vigor that young people bring to the fight for social justice."