What Tenth Amendment?
Over on the tenth admendment center they have a great write up on Nancy Pelosi’s response to the idea that a state could refuse to participate in Obamacare. A state is free to refuse the support and refuse to assist the federal government in administering the program, but Congress can authorize the federal government to administer the program on its own. Thus, Congress cannot force a state to administer a health insurance exchange, but it can authorize the federal government to administer such an exchange in any state that declines to do so Basically a state is within its rights to refuse, but the federal government will ignore it and run it themselves.