@giujohn,
I'd be more willing to be the complete other way.
With Hillary's ground game and voter registration efforts and transportation to voting locations, etc (in contrast to Trumps, which is basically non-existent) that the result on election day will be even MORE in favor of Clinton than the polls suggest.
If I'm a republican-leaning person but one who's not super excited about my candidate and his campaign isn't knocking on my door offering to help me request a mail in ballot or offering to drive me to a voting location or offering to help get me registered to vote or calling and reminding me to go.....well, that doesn't bode well for my chances of actually casting a vote.
But if I get a phone call in my living room and someone asks me who I support, I will say Trump...but on 11/8 I'm going to be more likely to sit on my ass and not show up.
I'm guessing that Hillary, because of her ground game, will win by greater margins than the polls suggest.