Guest: David Maraniss is an associate editor at The Washington Post and a distinguished visiting professor at Vanderbilt University. He has won two Pulitzer Prizes for journalism and was a finalist three other times. Among his bestselling books are biographies of Bill Clinton, Barack Obama, Roberto Clemente, and Vince Lombardi, Rome 1960: The Olympics That Changed the World, They Marched into Sunlight (winner of the J. Anthony Lucas Prize and Pulitzer Finalist in History), and his latest, Path Lit by Lightning: The Life of Jim Thorpe.