Then by your very own criterion even Ron Paul is not a "truly principled man of liberty-ethic", since he's formed many alliances with politicians who grossly oppose certain fundamental freedoms.
Your over analytical gold standard of inclusion does more harm than good. You're trying to win a chess game with only your pawns. You're advocating we disregard the movers and shakers who can strategically help us advance certain issues to our benefit.
Obviously, we won't back Farrakhan in a gun control debate. But when it comes to foreign policy we should be pushing his message to the forefront. We're not after Farrakhan, we're after his huge following. We're not supporting Farrakhan, we're supporting his stance on foreign wars.
You're so bogged down in idealism that you are missing the forest for the trees.