Nate Cohn

Nate Cohn @Nate_Cohn

@kwcollins The logic of poll averaging is eroded by the shift to a model-based view of survey research, where pollsters make bias-variance-cost trade offs that skew averages. The surviving argument is just an instrumental "it works," which is important but not a logical/theoretical basis — PolitiTweet.org

Nate Cohn @Nate_Cohn

With this in mind, the dynamics heading into tonight's debate are pretty fascinating. It sure seems like Bloomberg--not Sanders--will be the focal point of attack, and that would only tend to widen the door to Sanders — PolitiTweet.org