Why stop with ObamaCare.  What about the Department Education, social security, medicare, food stamps, etc.  States have the right and the duty to it's citizens to nullify these laws.  Just because the supreme court says its the law doesn't make it so.  They are the Fedgov who do you think they'll side with..
What are you going to do when the Supreme Court interprets the 2nd amendment incorrectly?  Nullification and the threat of secession is the states only way to protect itself and citizens against the Fedgov.  
I've read the wise words of Thomas Jefferson in the Declaration of Independence.  The South had every right to secede, I don't care what any liberal law school lawyer has to say.  