I would X out the word discouraging in your title and be very clear that the Grand Old Pedolphile Party is cutting off the path to any education. It is their own best interest to keep the electorate stupid, in their place(under the GOPP thumb) and irrelevant to boot.
Actually, the reverse is true.
If you look at any minority group, the more education they get and the more affluent they become, the probability they vote GOP rises. Pew does this survey annually, you can easily go look it up.
As for white voters, the percentages pretty much stay the same with income group. There’s a dropoff in GOP voting that happens at the very top of the educational ladder that benefits the Dems, but there simply aren’t that many Americans with doctorate degrees to make a difference.