Pre-election polls are of likely voters. They don't report the number of people who say they are "not likely to vote" and they also don't report the number of Likely voters who are "undecided". At least there's nothing of the sort in the Real Clear Politics poll tables. So those are two sources of unpolled voters that could have gone for Hillary.
As for exit polls, I want to see an exit poll broken down by vote-counting method before I believe that Soros has uncovered vote-rigging in the Democratic primary. We have met the enemy, and he is us — Pogo
