In today's New York Times, Adam Nagourney cites six reasons why the presidential race still isn't over, and of course it's always true that things can change over the next few weeks, that Obama's newly registered voters may not actually turn out, that there's the race wildcard, and so on. But there's a certain point late in the fourth quarter of a football game when it's fourth and long with one team way behind, and you can theoretically say, "All they need is to get this first down, score a quick touchdown, then return an interception for a touchdown, successfully recover an onside kick, score again, and they can pull it off." Yes, all of that is theoretically possible, but quite unlikely, especially if the other team has home field advantage and the ab...