I not only voted for him, but donated and worked for the campaign and stood on a road overpass with Trump signs.
I was working on Boston MA, in the run up to election day 2016.
I saw the folks on the overpasses waving Trump signs there. I knew that they were far fewer there than anywhere else, but that they were even there in the fist place, told me that the election was not going the way the pollsters were predicting.
The second thing was the rallies....20K people who waited in line ALL DAY, for a 1 hour stump speech. Those folks who attended are motivated enough to get out and vote and be the first in line.