Let's be real here, if there's one side that has an anti-science stance it's the republicans. They are pandering to (when they are not themselves) climate change deniers, evolution deniers, flat earthers, qanons... Those people don't vote democrat.

As for postmodernism, it is far from mainstream in academia, and you seem to have a very narrow idea of what it is. I can only recommend the following video (by an actual scientist!): https://youtu.be/ESEFUaEA7kk