Yeah, James Carville's Democrats strike again. Treat this as nothing other than an advocacy group poll.
It's basically Democrat trolling the media at the end of the day to show Hillary! is up big. And if that's the best they can come up with in NV, Hillary is in trouble there.
Automatically discounting polls by certain pollsters or done for advocacy groups is misguided (and the knee-jerk responses to that effect would be amusing if they weren't so repetitious). I really doubt that most pollsters would fudge their data to get a desired result -- although it can certainly happen; remember Strategic Vision? It's certainly true that a pollster's models or methodology can cause them to consistently lean to one side or the other; but this becomes evident with enough data, and it can be adjusted for. 538 has this pollster with a D+2.4 bias, and if you apply that to the numbers in this poll then they look to be in line with other recent polls.
Also, a reputable pollster isn't going to fudge their numbers just to give the group hiring them the result that the group wants. But the hiring group may choose a particular pollster
because of the pollster's known bias in order to get as favorable a result as possible. That's likely the reason the group behind this poll used Democracy Corps. It's the same reason that Breitbart uses Gravis, which tends to have a Republican bias. If the group paying for a poll doesn't like the result they get, they can always choose not to release it. This undoubtedly happens during any campaign.
