It's reasonable to question the validity of this result  --  last time there was a serious discrepancy between all polls and the election results, we learned afterward that Diebold voting machines had been programmed to alter their counts.  And that was long before the Russian government started hacking State electoral operations.  

Maybe Trump's candidacy was so unique there was no way to accurately predict results.  But all those other State-level races that came out the exact opposite of all polls?  Nothing exotic about them  --  except for the fact that the R underdogs won, every single time.