Polling in America sucks.
True, but it doesn't mean, it sucks blindly. It's pretty clear, that the polling error depends to a larger extant, that there is bigger and bigger share of
[mostly not so well-educated] voters that just doesn't answer polls because they mistrust pollsters/media/the institutions/establishment whatever you call it.
Folksy Obama (or Bill Clinton) vs Elitist Romney, they leaned Obama. But with Trump on the ballot or GOP embracing Trump + media/the institutions/establishment sucking up for Dems so hard they do now, it is pretty clear which side these voters lean.
Now a lot of these voters are probably anti-vaxxers. Different mandates will make them, likely, even more mistrustful towards pollsters etc.
If you have to bet, which side pollsters likely are going to underestimate, the answer is clear.
