I'd go with WV. Kentucky could go for a populist Democrat who supports coal and downplays social issues however.
Anyway, all of these places approach 0%. Kentucky is the only one with a strong statewide Democratic Party, but it's a fluke. Eventually it will go the way of every other Appalachian state, likely sooner rather than later. I voted Arkansas since there's an extremely slim chance Hillary could win it if multiple factors conspire in her favor. West Virginia would be more likely if Democrats nominated Manchin, but that will never happen, so...