538 did a good article about this: https://fivethirtyeight.com/features/trump-supporters-arent-shy-but-polls-could-still-be-missing-some-of-them/ https://fiveth

538 did a good article about this: https://fivethirtyeight.com/features/trump-supporters-arent-shy-but-polls-could-still-be-missing-some-of-them/ https://fivethirtyeight.com/features/trump-supporters-arent-... The tl;dr is that there's more evidence against it than for it. Polling errors are typically caused by unrepresentative polling - southern latino voters (one of the key shifts for Trump in Florida) in particular are hard to reach for polls, because there can be a language barrier.