Ken Burns on Colbert to promote his new documentary, "The Address"
From the PBS website about the show:
THE ADDRESS, a 90-minute feature length documentary by Ken Burns, will air on PBS in the spring of 2014. The film tells the story of a tiny school in Putney Vermont, the Greenwood School, where each year the students are encouraged to practice, memorize, and recite the Gettysburg Address. In its exploration of the Greenwood School, the film also unlocks the history, context and importance of President Lincoln’s most powerful address.