forget that the polls had Brexit failing by a wide margin right up until & including the day of the vote... when Brexit won easily.
The polls have been swinging Trump's way for more than a week now & some have him in the lead, others show it as a neck & neck race with 3 debates to go & Hillary's health still a big question mark... will she drop out?
http://www.electoral-vote.com/ had Hillary marching to easy victory a short time ago, now has her with 4 delegate margin of victory if everything stays as is... but they have her leading in BOTH North Carolina & Michigan by only a 1% margin. If EITHER of them flipped to Trump he would win the election if all others remained the same.
The LA Times/USC poll has Hillary making a slight comeback with Trump's lead dropping to 5.4% nationally.
http://graphics.latimes.com/usc-presidential-poll-dashboard/
Even
http://projects.fivethirtyeight.com/2016-election-forecast/ which had given her a 90% chance or so of winning about a month ago has her odds dropping to 58.5% to Trump's 41.4%.
The issue of how honest the MSM polls are is exemplified by what has been going on at Reuters:
Hillary Lead Over Trump Surges After Reuters "Tweaks" Poll
http://www.zerohedge.com/news/2016-07-30/clinton-lead-over-trump-surges-after-reuters-tweaks-poll
Reuters Baffled As Clinton's Lead Over Trump Suddenly Evaporates
http://www.zerohedge.com/news/2016-08-06/peak-hillary-reuters-baffled-clintons-lead-over-trump-suddenly-evaporates
Trump Regains Lead In Latest Reuters Poll: We're Gonna Need Another "Tweak"
http://www.zerohedge.com/news/2016-09-03/trump-leads-clinton-latest-reuters-poll-were-gonna-need-another-tweak