I hit a quick dead end when I looked for the origin of these terms. It seems to be fairly common knowledge that syndicated columnist Sam Francis coined them for the Democrats and Republicans, respectively.
But something tickles me in the reptile part of my brain like a malignant feather. Don’t these terms go way back, to the post-Civil War era?
(Apologies in advance if this has been asked before. Just you try to do a search on the terms “party” “evil” and “stupid.” They’re some of the more popular words around here.)