Betting markets drop Hillary's chance of winning from 72% to 58% in one weekend

Betting markets are not scientific like polls, I guess, but they have things going for them that polls don't. If a pollster calls you and wants to know what you think about something, it was the pollster - not you - who initiated the conversation and really wanted to know. You just decided to go along and respond. And you've really got no skin in the game, so you might tell the truth - you probably will - but the truth is you can say whatever you want and it will make no difference to you either way. People who actually bet on things like the outcome of presidential elections are making a willful decision to do so, and they're putting their own money on the line. So they might still be wrong - maybe they believe the media too much, or too little (how that's possible I'm not sure), or they don't really read the movement in the polls correctly. But one thing you know is that they're invested in what they think.