He's a gentle man, lean and soft-spoken, careful to begin his lecture with an explanation of principles like the right to counsel. The passion in Frank Lindh builds only when he describes the details of what happened to his son, John Walker Lindh, the bearded young man who was tagged as the American Taliban. In the waning days of George Bush's administration, the senior Lindh is asking the president to commute the rest of his son's 20-year sentence, now seven years along. It's almost certainly a hopeless quest. Bush is not a man prone to second-guess himself. ... In retrospect,...