Then he went one better and invalidated the whole law due to the severability issue. In his 78-page ruling, Judge Vinson declared that the government can't do whatever the heck it wants and call it "general welfare":
The Necessary and Proper Clause cannot be utilized to “pass laws for the accomplishment of objects” that are not within Congress’ enumerated powers. As the previous analysis of the defendants’ Commerce Clause argument reveals, the individual mandate is neither within the letter nor the spirit of the Constitution. To uphold that provision via application of the Necessary and Proper Clause would authorize Congress to reach and regulate far beyond the currently established “outer limits” of the Commerce Clause and effectively remove all limits on federal power.The full ruling is here and it's everything I've been ranting about for months. The government, no matter how virtuous the intention, can't call inactivity "activity" and punish you for doing nothing. Otherwise it's compulsory broccoli and exercise for everyone, and the end of limited and enumerated powers.
Update - Choice cuts here, with a Tea Party shout-out.
Extra - "Simply the best!" says the Volokh Conspiracy: "...by far the best court opinion on this issue so far."
More - Opinion Journal: "The Constitutional Moment."