In the last two elections Trump has outperformed polling by 9% and 5% respectively.
Most polls oversample dems, compounding the "shy Trump voter" problem.
And I believe in the shy Trump voter theory because there's no way in hell I'd ever tell a stranger I was voting for Trump (either by answering a poll or wearing a red hat, putting a sign in my yard, etc). Leftists are much more violent and vitriolic and I want no part of any confrontation.
The MSM is saying "unlike the past two elections this election has no underground Trump voters". Haha, BS. I think there may be more underground votes this time especially with older people. The left just gets more unhinged and violent daily and face next to no consequences. Nope, keep my head down and mind my own business.