All this tells me is that many KY 'Democrats' are either a spiteful bunch, at best, or a racist bunch, at worst
I'm not a big fan of the "Obama lost KY because of race analysis".... even if you look at the exit polls and say that 20% of KY voters thought race was a major factor (although there are still multiple ways to interpret that), Hillary still would have won by a significant margin.
I think there is more to this "anti-elitist" theory of KY voters. How Hillary was able to position herself as such is a fascinating question, although I think there are some other threads that have debated this more extensively.
I'm still not sure how accurate this poll is though, it does seem like a potential outlier compared to other recent KY matchup polls. If true, this does indicate major softness amongst McCain's supporters in this region as the dynamics of the race change and the Dems consolidate their base.