Like former Senator/Governor Zell Miller said, "I didn't leave my party, it left me".
The same holds true here.
Zell is still a registered Dem. He campaigned for President Bush in '04, but before that, he was GUNG HO for the Clinton and went to bat for him, over and over and over again. And he did NOT go off to some fringe party.
The facts is, that neither the Libertarian nor Constitution parties are ever going to gain any respectability or power; not ever! All they do is draw a bunch of KOOKS and when enough political naifs go off to vote for them, what happens is that the damned Dem wins. It's as simple as that. So being a DOG IN THE MANGER/ CUT OF YOUR NOSE TO SPITE YOUR FACE kind of person, neither holds up your supposed "principles", nor does it teach the GOP or XXX a lesson at all.
Maybe, when you manage to finally, if you ever do, grow up politically, you'll begin to understand what's what and stop thinking like some bratty kid, with a case to the terrible twos.