Power Line: More Poll Follies: "The poll's internals are easily accessible--which is praiseworthy--so it takes only a moment to determine that the October poll sampled 34% Democrats and 29% Republicans, while the September poll sampled 33% Republicans and 31% Democrats. So it's hardly a surprise that Kerry did better in the October survey. If the pollsters sampled only Democrats, they could show that Kerry was sweeping toward an unprecedented victory."
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Read the book: "How to Lie with Statistics" by Darrell Huff and Irving Geis. You can get it at Amazon