From this extremely good article on the poorest town in America

They say, why aren’t these people voting their self-interest? People always vote their self-interest if they can see it. If they believe the government doesn’t work, if they believe that the Democrats don’t really give a shit about people like them, don’t want to be in the same room with them, they want their vote but don’t want to hang out with them, then as they see it they’re voting their self-interest,” he said.