Or a different take (because we didn't really do the "numbers" and removed all variables and angles to this):
- Right-leaning individuals are more likely to want to live in rural areas. Arguably to be left alone by leftist policies. So there is an element of filtering. Additionally, perhaps rural-living individuals are simply less-likely to go to higher education.
- People with more education have spent more time being indoctrinated by left-wing education. Let's be honest, schooling is heavily biased towards the left, especially higher-education.
- Maybe left-leaning individuals are more likely to send their kids for higher education and degrees.
- And the opposite of above. As an example, because I lean "right", I'm less likely to send my kids to an American indoctrination camp to get a degree. You could laugh and judge and claim disbelief, but this is very real and I'm serious. I've literally had smart, well thinking friends from school turn into zombies spouting left-wing talking points after moving to an American college. And not "smart" left-leaning talking points, they're arguably brain-washed and not even using their intelligence to reason their left-leaning views with me.
- People with more education are more likely to have been pressured by peer-groups to vote left. See: Cancel culture and intimidation on campuses against right-leaning individuals/speakers. And the opposite of that, left-leaning individuals are pushed out of rural areas due to pressure or push back from locals.
- People in urban centers are more likely to be exposed to political ads, campaigns, and things like "DEI" re-education programs in workplaces.
- Rural areas are less likely to have or fund arguably weird teaching policies to children at a young age. E.g. the whole drag-queen story hour stuff that the right is upset about.
- Left-leaning policies and programs are more likely to get funding by NGOs.
So you want to argue numbers, let's argue them. But don't pretend like there aren't any variables that drive those numbers other than "oh uneducated (implying stupid) people vote right" which if you are honest, was exactly the angle you were going for as a dog-whistle to other "educated" or "left-leaning" readers.