In a recent article by Ann Coulter, Eighty-Four Percent Say They'd Never Lie To A Pollster, she looks at the polls leading up to the presidential elections of the past.
It is interesting to note that the polling data has always been skewed in the Democrats favor prior to the actual election.
Reviewing the polls printed in The New York Times and The Washington Post in the last month of every presidential election since 1976, I found the polls were never wrong in a friendly way to Republicans. When the polls were wrong, which was often, they overestimated support for the Democrat, usually by about 6 to 10 points.
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Are we looking at a form of the "Bradley affect" for the media?