Here on The Takeaway, we don't make predictions about the upcoming presidential race. But, as always, history repeats itself. So a look at the past can give a glimpse to the future. We call on our friend, historian Kenneth C. Davis for a little help. He's the author of "Don't Know Much About History". And today he's talking about one-term presidents and what the failure to win re-election means for their legacy. Tell us what your favorite campaign slogans are. And what would you make the Obama or Romney slogan for 2012?