What's the Constitutional Clause that Provides for Nationalized Healthcare?

States' Rights might throw a monkey wrench into Obama-care. The lead paragraph in a story reported in the Star Telegram goes:
Gov. Rick Perry, raising the specter of a showdown with the Obama administration, suggested Thursday that he would consider invoking states’ rights protections under the 10th Amendment to resist the president’s healthcare plan, which he said would be "disastrous" for Texas. SEE ARTICLE
Maybe we should start asking those hard questions, like just where in the Constitution does it indicate that the Federal Government has a role of any kind in health care? All of this nanny-state nonsense has to stop while we still have some control. We are well on our way to being a country enslaved by an out of control bureaucracy generated by politicians who think they have a right to dispose of all our hard earned treasure.