Walt Rostow's meteoric rise to power--from Flatbush, Brooklyn, to the West Wing of the White House--seemed to capture the promise of the American dream. Hailing from humble origins, Rostow became an intellectual powerhouse: a professor of economic history at MIT and an influential foreign policy adviser to John F. Kennedy and Lyndon B. Johnson. Too influential, according to some. While Rostow inspired respect and affection, he also made some powerful...