i don't think it really changes anything, though. i mean, it suggests he got high turnout - he was able to overwhelm. but, the explanation could very well be that he was piggybacking on trump voters, who see sanders as their second choice. you can vote twice in these open primaries.
i'm all for open primaries. but i really think you should only be able to vote for one party.
you'll note that she won all the southern counties, which are bordering kentucky. that's a better predictor of what's coming. he's not going to lose kentucky or west virgnia because of minorities. he's going to lose white men in these states, as he did in tennessee and the other states in the immediate vicinity.
but, the fact that his numbers are improving with minorities, at least in the north, is promising - should he run outside the party.