Well,
I'm still not sure yet that Justice will win. Based on some recent elections, KY-GOV and all the other downballot races, WV-2014 etc that republicans tend to overperform the polls by a lot, like if a lot of those living in coal areas changed their mind just before casting their ballot.
KY-Gov was probably just a polling failure. I hope it is not repeated in West Virginia or Missouri.
Keep in mind that Jon Bel Edwards in Louisiana and Jim Hood (albeit for a lower ballot office) won in Mississippi and some polls underestimated both of them. So I am not too worried.
Also, Kentucky has quite a history of Democrats overperforming in polls.
Well, MS and LA aren't coal areas though.