The difference, if I recall, is that Rasmussen in 2016 was right there with the consensus (regarding vote totals - modest edge to HRC). I don't know what they are outliers most of the time, or what would make them closer to the consensus other times.
This particular one seems out there. That said, Trump clearly recovered a bit from the end of the shutdown and the SOTU. He is a persuasive orator for many, and that kind of venue would admittedly be good for him.