They vote for their economic interests, in the sense that they vote in the way that they believe furthers those interests. Whether that vote actually furthers those interests is another matter. Republicans have been very successful at convincing people that they’re the ones who are good for the economy and everyone who works hard will prosper under their policies.

I don't think thats the way most of them see it. Right-wing propaganda has effectively convinced them that unions, government regulations, worker and environmental protections, etc. are all bad and the free market will magically solve everything.

Decades of Red Scare propaganda convinced those people that benefits, healthcare and labour rights are commie desires… and how dare you want to bring communism into America