I expect he's talking about the stupid use of rhetoric rather than actual stupidity of false reasoning or false beliefs. Basically, he's saying that the Republicans would be better served by packaging their stupidity with a prettier bow, or by putting prettier lipstick on the pig.That's a great way to put it. They know they're gonners demographic and ideology wise. So they can choose either getting not stupid, or staying stupid with a prettier bow like you said. My guess is they're too stupid to even realize how stupid and on the wrong side of history they are.