Nate Silver: Why Obama Is Favored To Win
It has to do with the post-convention bounce.
On average, between 1968 and 2008, the challenging candidate led by 10 percentage points in polls conducted just after his convention. By comparison, the challenging candidate eventually lost the popular vote by an average of three points in these years. That means the post-convention polls overrated the challenger by an average of 13 points.Click here for reuse options!
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