“Smith, a well-regarded practitioner of military history and Presidential-life writing, comes straight to the point in the first sentence of his preface: “Rarely in the history of the United States has the nation been so ill-served as during the presidency of George W. Bush.” By the book’s last sentence, Smith is predicting a long debate over whether Bush “was the worst president in American history,” and while the biographer doesn’t vote on the question himself, the unhappy shade of James Buchanan will feel strongly encouraged by his more than six hundred pages.” How Bad Can a President Be?