Then that should tell him his lunatic politics are unwelcome in the US by the majority voters. Either change his ideology or go back to clerking at Walmart.
To win an election you have to run as a Democrat or a Republican, generally. That does not mean you have to *be* one or the other, you just wear their hat during the campaign. With districts so carved up that one or the other party is guaranteed all too often to win, I think it is funny.