<<Are Rasmussen polls reliable?

After the 2010 midterm elections, Silver concluded that Rasmussen's polls were the least accurate of the major pollsters in 2010, having an average error of 5.8 points and a pro-Republican bias of 3.9 points according to Silver's model.>>

https://en.wikipedia.org/wiki/Rasmussen_Reports

The 37% figure is from a Q poll.

http://www.cnn.com/2017/01/27/politics/trump-approval-rating-quinnipiac-poll/index.html