The polls were accurate actually.

[RetiredGySgt]

In Wisconsin, Clinton's Pre-Election Poll Numbers Were Accurate

Seems the egg heads ignored the fact that over 10 percent had not declared for anyone.

 

[depotoo]

As well as oversampling of certain Dem demographics.

 

[JakeStarkey]

Yep. Whatever. Perhaps. We don't know, do we. Have to guess, I guess.