myth is that Trump's victory represented some sort of catastrophic failure for the polls. Trump outperformed his national polls
by only 1 to 2 percentage points.
He beat his polls by only 2 to 3 percentage points in the average swing
there were individual pollsters that had some explaining to do, especially in Michigan, Wisconsin and Pennsylvania, where Trump beat his polls by a larger amount.
But the result was not some sort of massive outlier; on the contrary, the polls were pretty much as accurate as they'd been, on average, since
FiveThirtyEight's final forecast gave Trump a 3 in 10 chance of winning
the Electoral College. Others had 1 in 100 shot.