Progressives who care about fighting such things as war, corporate welfare and assaults on our civil liberties might do well to register GOP for the primaries and help Ron Paul get the nomination. They can still vote for whatever Dem or independent candidate they want in the presidential election.
Here's what Ralph Nadar has to say about him:
“Look at the latitude,” Nader says, referring to the potential for cooperation between libertarians and the left. “Military budget, foreign wars, empire, Patriot Act, corporate welfare—for starters. When you add those all up, that’s a foundational convergence. Progressives should do so good.”