Here's Brad DeLong:
The best pollsters, Silver said, “let the sample tell you what it is by themselves.” The ones who didn’t “put their finger on the scale” and didn’t make assumptions about the voting public were most successful.
Just going with what the data said instead of making assumptions is usually the best practice whenever you're doing any kind of scientific survey and that worked again this year…. I’m a pro-horserace guy. I’m more interested in diagnosing 2016 now than Benghazi, for example, because that’s where my bread is buttered. But if you’re going to do horserace, then do it the right way because it can be more data driven.