Fox News Voices

This article touches on a possible explanation - liberal, policies don't actually do what they say on the tin, they aren't in fact pro-poor. It particular - artificially pushing up the cost of housing in blue states is making life worse for the poor. But try explaining poor policy using facts to a someone voting for such policies.

https://www.forbes.com/sites/timworstall/2015/01/04/solved-why-poor-states-are-red-and-rich-states-are-blue/#7d88c34b1d60