If you want more evidence that you shouldn’t trust online polls, check out the Newsweek poll results, which show the online poll results (black) side by side with the scientific poll (grey). The gulfs are huge, because for many reasons the people who (1) heard about the Newsweek online poll and (2) were willing to take the time and trouble to go to the site and make their choices are highly unrepresentative of the typical American, typical registered voter, typical likely voter, or any other group of people whose views you might want to know.
Thanks to reader Stephan Oestreicher for the pointer.
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