Once Again Marquette Poll's Sample Grossly Oversamples Conservatives, Undersamples Moderates

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Polls are only relevent if their sample is reflective of the electorate. As the graph demonstrates, compared to exit poll data (averaged from 2010, 2008 and 2006) the recently released Marquette poll grossly oversamples conservatives and undersamples moderates.

This is, of course, quite significant considering that the same poll shows Barrett beating Walker 50 to 42% among moderates.