Today’s Classroom Lesson: Demystifying Opinion Polls

Between now and November we’ll be awash in opinion polls, and partisans on both sides will be deploying them chiefly as a tactic of vote suppression—trying to discourage the other side that all is lost. Now, I could give a classroom style treatise here on the tricks and defects of opinion polling, or I could just enlist another scene from Yes, Prime Minister, which explains the problem much more effectively:

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