That's interesting b/c I see it very obviously in mine with the partial exception of myself. The more professional and private sector their job or spouse, the more conservative they are. E.g a real estate lawyer is conservative, a lawyer for the state is liberal, a software engineer is a communist, and the musicians are libertarians or socialist-lite.

Professional or artisanal work are petit bourgeois positions, so are flexible in their outlook regardless of income.

I have rural farmers and truck drivers in my extended family. That stereotype is low income + conservative.

If they own their own land or equipment it makes more sense. It's their relationship to production that is the driving force, but if they are not self-employed and don't own their own equipment it is a little more of an interesting situation.