James A. Garfield was one of the most extraordinary men ever elected president. Born into abject poverty, he rose to become a wunderkind scholar, a Civil War hero, and a renowned and admired reformist congressman. Nominated for president against his will, he engaged in a fierce battle with the corrupt political establishment. But four months after his inauguration, a deranged office seeker tracked Garfield down and shot him in the back. But the shot...