Nate Cohn @Nate_Cohn
@gelliottmorris @NateSilver538 'all else equal' is the hang up. the material question is whether MRP competes with topline-based averages/regression in the actual pre-election information environment. if we get the microdata for all the polls being aggregated, MRP could compete. that's not the world we have — PolitiTweet.org