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Ahead of #2020Elections, here’s a thread of the 2016 election poll evaluation conducted by #AAPOR members

aapor.org/Education-Reso… (1/7)
National polls were generally correct and accurate by historical standards.

They indicated Clinton had a 3 percentage point lead, and she won the popular vote by 2 points. (2/7)
State-level polls showed a competitive, uncertain contest, but clearly under-estimated Trump’s support in the Upper Midwest (3/7)
Why did they under-estimate support for Trump? There are a number of reasons.

First, there were many voters who made their vote choices in the final week or so of the campaign. (4/7)
Also, many state-level polls did not adjust for over-representation of college graduates. (5/7)
Finally, some Trump voters who participated in pre-election polling did not reveal themselves as Trump voters until after the election (6/7)
Read the full evaluation of 2016 election polls in the U.S. (or even just the executive summary!) here:

aapor.org/Education-Reso… (7/7)
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