How Did the Polls Get it So Wrong?

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A man dressed in red-white-and-blue sits on the curb during a protest against President-elect Donald Trump, Wednesday, Nov. 9, 2016, in Seattle's Capitol Hill neighborhood.
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After last night's results, all eyes are on the pollsters, many of which predicted Hillary Clinton with a solid win over Donald Trump. The New York Times had Clinton with an 85 percent chance of winning, while Five Thirty Eight predicted a 71.4 percent win, and the Princeton Election Consortium predicted around 90 percent.

Sam Wang, a neuroscientist and data analyst at Princeton University who co-founded the Consortium, is among those who got it wrong, and he joined us a few days ago for one final check in of the polls. We bring him back today to understand just how it was possible to get it so wrong.