Why Some Polls Are So Off the Mark

Bad Sampling:

There are currently polls showing results ranging from Obama by double digits (Newsweek and the L.A. Times) to a tie (Gallup). Most polls, including Rasmussen Reports, show something in the middle and that’s probably the best estimate of where the race stands today… and where it has been for the past few weeks.

In the case of the recent L.A. Times poll, this [poll sample] mix was 39% Democrats and 22% Republicans.
Rasmussen Reports

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