This is one poll, but if I were a Clinton supporter, I wouldn't be optimistic about this poll. NJ should be as good of a state for Clinton as NY (if not better, due to how urban it is), so a 9-point lead this far out is hardly great for her.
I mean, NJ is urban in a sense. We have no major cities(the cities we do have are small and run down) and plenty of wealthy suburbs. We also have quite a few "sparsely" populated ruby red countys in the northwest and southeast. Sanders, just like Republicans, should have a high floor but a low ceiling. Dont be shocked if the result map looks identical to the 2008 general election.