Same Poll, 4 years ago:
Sanders thumps Trump 49 - 39 percent
Clinton tops Trump 46 - 41 percent
I suspect there are fundamental problems with most polls, and they can’t seem to figure out how to properly weight Trump’s support.
It's not that they cant; it's that they don't want to.
That does not mean the poll was garbage. Remember that Clinton did beat Trump by 3 percentage points in the popular vote. This shows 5 points. So off by 2 points, not by 7 points as someone said earlier. I think this poll is not as bad as some here say - remember it is a popular vote poll, not an EV poll.