Markets, if anything, are more accurate predictors of how the race will turn out than polls. Asking a bunch of people "Who do you think will win?" will tell you who will win better than asking a bunch of people "Who are you voting for?" Of course, the markets are effected by the polls. It'd be idiotic to bet against a huge poll lead. But they're also a lot smarter than the polls, and in a tight race they'll predict the outcome better. Obama has never been down on intrade before, and he better pick up pretty fast.