MICHAEL HYATT Sometimes you learn from positive role models. Often you learn from negative ones. This is one of the reasons I love to read history—you inevitably get both. After watching Steven Spielberg’s Lincoln, I decided to reread Team of Rivals by Doris Kearns Goodwin. It is a page-turning account of Abraham Lincoln’s presidency and his political genius. At the beginning of Lincoln’s first term, he appointed each of his former Republican rivals—those who had run against