Here is a different take on the medical marijuana ruling. The New Republic's Editors think the decision was correct because, had the Supreme Court ruled against the government in this case, it would have opened the door to challenges of many other regulatory schemes.
In essence, TNR's editors are arguing that slavery should not have been addressed because it might have threatened other property rights. (Yeah, yeah. Close enough.)
What a weird conservatism.
The notion that private, non-commercial, entirely intra-state medical marijuana activities impact inter-state drug traffic enough to validate federal commerce clause authority is just asinine. What the court has done is validate scoffing at the law, which in this case is an ass.