As an Ohioan, it just doesn't sit right that black Democrats should be able crossover and determine the Republican nominee, no matter if it's competitive or not. If Ohio had open primaries and Kasich got a strong primary challenge this year from say Mike DeWine or Steve LaTourette (not to say either one of them ever would have ran), I would still cast a Democratic ballot because that's my party affiliation and who I identify with closest. I wouldn't try to blatantly sabotage the other side.
Weren't you proudly cheering on Chris McDaniel yesterday?