I’ve noted a curious trend in Gallup’s daily tracking poll: the margin between Barack Obama and John McCain seems to be correlated to the day of the week the poll is released.
Pollsters have long known that the demographic makeup of a random telephone sample changes from night to night. Those with families are less likely be available at home during weekend polling. Since that demographic tends to vote more Republican, weekend polling often understate support for the GOP. Polling companies use weighting to attempt to balance unbalanced weekend samples. But the Gallup traditional daily tracking poll doesn’t seem to have balanced the disparity enough.
http://www.bobkrumm.com/blog/?p=2034
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