> In particular, the US Congress has power over almost all commerce. And, post-Wickard, http://en.wikipedia.org/wiki/Wickard_v._Filburn http://en.wikipedia.org

> In particular, the US Congress has power over almost all commerce. And, post-Wickard, http://en.wikipedia.org/wiki/Wickard_v._Filburn http://en.wikipedia.org/wiki/Wickard_v._Filburn , all potential commerce. That case involves Wickard producing wheat for his own use. The court decided that his wheat growing can be regulated because he used that wheat instead of buying wheat. A lower court has upheld the Obamacare individual mandate tax on the same basis. (Since Obama says that the healthcare legislation is one of his significant achievements, Obamacare is giving him credit.)