 Jack Kersling, a pollster, gives Donald Trump a 64% chance of winning. Decision Desk HQ gives Trump a 56% chance of winning. FiveThirtyEight, Nate Silver's old shop, gives it a 50-50 chance of winning. And then polymarkets, where you can bet on the markets and people do, Trump has a 60% chance of winning. What's so notable is that many of these...