Na Ga Happen
I don't doubt that tenthers want to use nullification or something like it to block health care reform in their states, but they'll back down so fast it'll make your head spin. These are some of the same right-wing governors who claimed they wouldn't accept stimulus money and then ran around their states withe giant novelty checks touting the funding. They're hypocrites, and won't give their opponents an opportunity to pull out some low-income person who was denied federal care and died because of their callousness.
Although, if Texas or any other Southern state wants to secede, and take all their right-wing Congressmen with them, I wouldn't exactly object.