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@ dataguyx
Right, I think some misunderstand waht over sampling is.
If I ask 100 african-americans and 50 whites about an issue on race, I'm simply asking more african-americans os that I can get a more accurate picture of how african americans feel.
When calculating the poll, each african-america answer is calculated in respect to the african-american population at large as are the white votes, giving a very accurate interpretation.
If I were polling to find out how the Hagee endorsement hurt or helped John McCain, I might over sample the Catholic vote.