Why You Should Feel Free to Ignore Polls for a Few Weeks
http://www.nytimes.com/2016/07/23/upshot/were-about-to-enter-a-period-of-polling-volatility.html?_r=0
How close the polling average has been to the final result
Since 1980, the polling average 109 days before the general election has been off by about 7.5 percentage points.
One election
Average since 1980...