From the Huffington Post, a surprisingly detailed exposé on non-response in polling on the US precedential race: http://www.huffingtonpost.com/2012/06/17/gallup-poll-race-barack-obama_n_1589937.html
From the Huffington Post, a surprisingly detailed exposé on non-response in polling on the US precedential race: http://www.huffingtonpost.com/2012/06/17/gallup-poll-race-barack-obama_n_1589937.html
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