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Description The 2008 presidential election provided a "perfect storm" for pollsters.
Additionally, a potential Bradley effect -- in which white voters misrepresent their intentions of voting for or against a black candidate -- skewed predictions, and aggressive voter registration and mobilization campaigns by Barack Obama combined to Challenge conventional un.
A significant portion of the population had exchanged their landlines for cellphones, which made them harder to survey.
Description The 2008 presidential election provided a "perfect storm" for pollsters
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