we talked to ron chernow about george washington, david mccullough about john adams, and doris kearns goodwin about abraham lincoln. >> washington, under the surface, was a passionate, sensitive, complex man. he was a man of many moods and fiery opinions. he was really a fierce, hard-driving perfectionist, but it was all cloaked under this tremendous reserve and that very kind of stoical aura we know. >> it's possible to know john adams and especially because of what he wrote to his wife and she wrote to him, it's possible to know him better than any of those prains prince pal figures. >> when we look to who we are going to elect for president, we should look at their temperament. lincoln had an amazing set of emotional strengths, and you couldn't have even -- you could have even known that without his external resume. when he made a mistake, he learned from it and acknowledged it immediately. >> rose: what is it great presidents have? presidential historians tell us about their presidents next. funding for charlie rose is provided by the following: captioning sponsored by rose commun