As an outsider my thoughts :-
1) You've such a lousy political system. What, two main parties? The lack of real plurality led to a presidential election where people voted for the "least worst" candidate rather than the "best" candidate.
2) Polling companies have no f***ing clue.
3) Liberal media look for easy excuses - voters are racist, misogynistic... maybe it's just because Hilary was a really s*it candidate? Forget the emails and Benghazi, going back there was Whitewater and Vincent Foster... she's zero personality or charisma, no connection to people. Put a better democratic candidate up there, different result.
4) People around the world are getting sick of "political elites" stifling any debate by throwing labels. Here in the UK, there's been no debate on immigration because if you think an Australian system is the way forward ( have job / can support self, points system ) you're "zomg RACIST XENOPHOBE".
5) America labels itself a democracy, opportunity for all yet political "power" tends to be concentrated in family dynasties? Clinton. Kennedy. Bush. What next, Chelsea to run in 2032?
6) Like the result or not, a democratic vote gave a democratic result.