If Bernie Sanders were to defeat Hillary Clinton in Michigan’s Democratic primary, it would be “among the greatest polling errors in primary history,” our editor in chief, Nate Silver, wrote Tuesday evening when results started to come in. Sanders pulled it off, and now we’re left wondering how it happened. …
Here is our initial assessment of some possible explanations, along with comments from some of the pollsters who had reported a big Clinton lead: CONT.
Carl Bialik, FiveThirtyEight