The brain responds to challenges to closely-held beliefs the same way it does to mortal fear of death. You're not going to make any progress using logic here.
Smitty believes that anyone who isn't a conservative is a Democrat and all Democrats support Obamacare. He believes Obama is a "leftist" and anyone who doesn't believe the way he does is a "leftist" and that the two poles of the political divide are "Left" and "Right". He hasn't figured out yet that the divide is really "Top" and "Bottom".
Even if you could penetrate the quasi-religious certainty in his world-view, I'm not sure it would be safe to do so except in a therapeutic environment.