I have not really looked into this, but I am wondering if the people who already voted just hang up on pollsters in early voting states.
And this has been a good day for Republicans in poll numbers, all the data collected right after the email scandal. I am sure it will all subside by election day.
So I do not know why everyone is freaking out.
Perhaps, because their early vote numbers don't match what any other pollster has found, which I think has led to the discrepancy between their poll and all the others.