The "Bradley effect" is named after former Los Angeles mayor Tom Bradley, after he failed to win California's gubernatorial race a number of years ago, in which polling and voting reality didn't match up. It appeared that, even though polling is anonymous, many voters couldn't tell a pollster that there was no way in hell they were going to vote for a black man.
Well, theoretically, the election of Barack Obama as president, Deval Patrick as governor of Massachusetts, etc., was putting paid to this idea. Dear Leader himself would have us believe that we live in a post-racial America.
Well, you and I know that's not true.
And, now, thanks to Google, we have proof that the Bradley effect is probably still alive and well. And strongest in Appalachia. Dear Leader should remember he lost Pennsylvania's Democratic primary to Hillary Clinton; the "discrepancy" is high in western Pennsylvania.