During the 2004 U.S. Senate race in Illinois, candidate Barack Obama, in a quiet, reflective moment, pondered his emerging place in history. But his campaign manager, Jim Cauley of Pikeville, was thinking of something else, trying to keep Obama focused on the battle at hand. "We were together in the old State Capitol in Springfield, in the office of Abraham Lincoln, where Lincoln had been a lawmaker for the state of Illinois," said Cauley, "and Barack, an introspective guy, looked around for a few minutes without saying anything and then asked me, 'Jimmy, do you ever wonder what Lincoln would...