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Date: Thu, Dec 07, 2006, 06:00 AM PST

It is nearly impossible to imagine an election cycle without opinion polls or a product campaign without market research. But these social surveys are a fairly recent phenomenon, says Assistant Professor of History Sarah Igo.<br><br><a href='http://www.upenn.edu/pennnews/current/research/120706.html' target='_blank'>http://www.upenn.edu/pennnews/current/research/120706.html</a><br><br>

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