I think (perhaps) a better correlation is that cities that are run by liberals produce a dependent class that feel there is no need to be educated. Just sit there on the couch and wait for the check to come.
I seriously doubt the people who aren’t graduating even know what liberal means. They just go vote for Dems because that is what they are told to do by their parents. Gotta keep voting dem and punching babies out so the checks keep coming.
I will take your premise one step further.Most of those high school dropouts don’t even vote period.
Of course,if they did it would be for liberal Democrats but nearly all the ones I have met “just want to get my hustle on”and they think that politics is completely irrelevant to their lives.
Like New Orleans. Worked out just great for them, didn't it?