Reading through the complaint filed by 13 state attorneys general, against the health reform legislation, reader @calchala was struck by something that wasn't there: the lack of any specific case citation to buttress the underlying claim that it is unconstitutional for the federal government to impose on individuals a mandate to buy health care and to punish those who don't by levying a fine.  Here's the official language:

The Act represents an unprecedented encroachment on the liberty of individuals living in the Plaintiffs' respective states, by mandating that all citizens and legal residents of the United States have qualifying healthcare coverage or pay a tax penalty. The Constitution nowhere authorizes the United States to mandate, either directly or under threat of penalty, that all citizens and legal residents have qualifying healthcare coverage. By imposing such a mandate, the Act exceeds the powers of the United States under Article I of the Constitution and violates the Tenth Amendment to the Constitution.  In addition, the tax penalty required under the Act, which must be paid by uninsured citizens and residents, constitutes an unlawful capitation or direct tax, in violation of Article I, sections 2 and 9 of the Constitution of the United States.