I am unsure as to why a progressive would ever vote Republican. Progressives cannot politically exist on their own in this two-party system. They have to adopt one party or the other. Since the Republican party is completely and absolutely opposed to anything a progressive would believe in, they adopted the one party that has a minor shot at enacting policies they adhere to. There is no doubt they would likely vote D all the way down the ballot in every election. It’s the only opportunity at policy progression they have. It has been this way for a while so this claim isn’t some new prediction or revelation.