Book excerpt: No one man or woman has ever been in a position to see the presidents, and the presidency, so intimately, over so many years. They called him in for photo opportunities. They called for comfort. They asked about death and salvation; about sin and forgiveness. At a time when the nation is increasingly split over the place of religion in public life, The Preachers and the Presidents reveals how the world's most powerful men and world's most famous evangelist, Billy Graham, knit faith and politics together.