“Back in August, a study showed the ‘shy voter’ phenomenon was real, that up to 12 percent of Republican voters said they would not share their voting preference with a pollster.
The thinking behind the “shy” or “hidden” voter phenomenon is that the polls do not accurately reflect what’s really happening out there. So on election night, when the votes are actually counted, President Donald Trump could shock the world again with a come-from-behind win.
As we all know, this is what happened in 2016. Trump lost the national popular vote by only a few points, but won a bunch of states no one expected him to win, most especially state pollsters”. (Breitbart. Read more here.)