> Being dismissive of Trump’s chances early on in the Republican primary was the biggest analytical mistake of my career, and I think I deserved a lot of blame for that.
He went on to write a whole retrospective, which is exactly what you'd want to see:
https://web.archive.org/web/20160527093831/https://fivethirt...
So unless your standard is "pollsters must be perfect at all times", I dunno what else should be asked of Silver here.