To celebrate the birthday of our 16th president, excerpts from three past Morning Shows about Abraham Lincoln. Part 1: Ronald C, White, author of "A. Lincoln: A Biography." <talking about Lincoln's childhoo> Part 2: Lewis Lehrman, author of "Lincoln at Peoria: The Turning Point." <talking about his evolving views on slavery> Part 3: Phillip Kunhardt III, co-author of "Looking for Lincoln: The Making of an American Icon." <How Americans came to revere Lincoln after his assassination.>