Honestly, that map makes Ohio stand out just as much. I still don't get why Sanders collapsed so badly in Ohio. I mean, I'm not saying he should've won it, but if demographics really are destiny, he probably should've only lost it by 3-4%.
Yes, while there are other relevant factors esp. wrt voting rules and local party strength, the most obvious distortion in the Democratic map in this part of the country is that the Ohio Republican primary attracted a lot of voters who would have voted in the Democratic contest in most other states.