He's preached to every president since Harry Truman. It is one of the most unique series of friendships in modern politics, counseling these leaders under the tremendous stresses of war, politics and personal scandals. But evangelist Billy Graham simply refers to the last 11 presidents as his "friends."

"Each one I've known long before they ever became president, been in their homes many times, always called them by their first names, until they became president," Graham told Charlie Gibson at an extraordinary lunch with the three living former presidents, Bill Clinton, George H.W. Bush and Jimmy Carter, who came to help dedicate the new Billy Graham library in Charlotte, N.C., in May.