Yeah, but in the post-2016 political world, polling is a bit of a illusion - or at least until it proves itself again.
Awkwardly, I always hated the use of proprietary modifiers to shift raw polling numbers one way or the other. It just smacked of confirmation bias. However, with Trump, I think any raw polling numbers need to be shifted in his favor. Except for Rasmussen, which probably goes just a bit too far in his favor.
If NBC has him -10 for job performance, and Rasmussen has him at -2, then the latter is probably more accurate when it comes to voting.
Especially with the current crop of Dems.
And in the case of polls saying we got 2016 right or close, look at their polls for the month before the election. The media use polls to show their candidate winning to create momentum then in the last few day before the election they slide them a little closer to claim accuracy while they are manipulating them again in the lead up to the next election. Viscous circle...