I didn't know that smart people (e.g. college graduates) were
over-represented in pre-election polling, but the analysis of why the
election results differed from predictions were a late swing towards Trump
(Comey...) in the closing days of the election, and possibly also the result
of substantial numbers of Trump supporters declining to state their voting
preferences to pollsters--I assume out of shame.
Read the rest here.
http://www.businessinsider.com/trump-hillary-clinton-why-polls-wrong-2017-5