Trump has garnered 5 or 6 times the attendance at his events than Hillary has, with many turned away because of lack of room. Kind of belies a lot of the polls showing her ahead - or even.
Also on-line viewing of the events (YouTube) average over 15,000 while Hillary is less than 1,000. So either the polls are not getting the information right or the people are going just for entertainment. I don’t think the later as some of the events are in the daytime and you have to wait in line for hours. So I tend to think the polls are only showing a sample of what 2012 was like.
One last point, if polls were actually accurate, then why have elections or votes, just use the poll to select a president.