'Amazing Grace,' a song of suffering to pull us together
Watch VideoJUDY WOODRUFF: One week ago today, President Obama gave the eulogy for the Reverend Clementa Pinckney, one of nine people shot and killed at the Emanuel AME Church in Charleston, South Carolina. You may recall he closed his remarks by turning to song in a surprise rendition of the spiritual “Amazing Grace.” Special correspondent John Larson has a look at the song’s unique role in histor…