Re:FiveThirtyEight has a GitHub repo with story-related data...
by SyneRyder on Wednesday June 01, 2016 @12:28PM
(#11815756)
They got more than Michigan wrong. They also had Clinton with a 90% chance of winning Indiana, and that's not the way it went.
http://projects.fivethirtyeight.com/election-2016/primary-fo...
It's unfortunately burned into my mind, because of the 24 bets I made on the primaries this year, it's the only one I got wrong, but I lost $75 on that bet.
FiveThirtyEight's model could work without polling (it's not the only predictor they use), but they don't publish results until there are at least two polls conducted. I would call that a feature, not a bug.
Also, FiveThirtyEight correctly predicted the outcome of every primary race that it modeled, on both sides, except one (Michigan Democratic primary).