The key to understanding Lincoln's philosophy of statesmanship is that he always sought the meeting point between what was right in theory and what could be achieved in practice. By Dinesh D'Souza Most Americans -- including most historians -- regard Abraham Lincoln as the nation's greatest president. But in recent years powerful movements have gathered, both on the political right and the left, to condemn Lincoln as a flawed and even wicked man. For both camps, the debunking of Lincoln usually begins with an exposé of the "Lincoln myth," which is well described in William Lee Miller's 2002 book Lincoln's...