The mandate to buy health-insurance may be an unconstitutional encroachment of the U.S. Government onto the liberty of its citizens. Furthermore, the rigid federal rules in the health-insurance reform law of 2010 may represent yet another way by which the state governments have been rendered servile in begging Washington for breathing room in a domain that may be rightly theirs, constitutionally (i.e., beyond the enumerated powers assigned to the U.S. Government). The bigger story in this jurdical piece on healthcare is perhaps whether American federalism itself was finally being extirpated and expunged in favor of consolidation.
The full essay is at Essays on Two Federal Empires.