Slave Preacher News Today

>> reporter: and on this newly discovered tape, dr. king citeds an old slave preacher, giving this message to anyone who would listen for years to come. >> lord, we aint what we ought to be. we aint what we want to be. we aint what were going to be but thank god, we aint what we was. >> powerful, powerful stuff. >> yeah. >> 53-year-old reel to reel tape was discovered in a tennessee attic several years ago. and the last several minutes are only now being made public. >> its from an interview don...