But the state of California failing to impose sanctions on marijuana in no way conflicts with federal law which does impose such sanctions. As I was saying there is a legitimate contention that the Arizona law conflicts with federal law. (Again not commenting on the verdict, merely that it can legitimately be argued and thus deserves to be heard.) There is no way that a state's choice to provide liberty from state prosecution for a particular act could possibly be construed as conflicting with a federal law against that same act.
And please mention the cases if you don't mind. That's the meat of a good legal discussion!
edit: There is a good case to be made that by allowing regulation and taxation Prop 19 conflicts with federal policy, but there is a simple defense against this - one I'm not sure California will employ if it comes to it, but I hope they would. Simply this: allow jurisdictions to follow prop 19 to the letter, but not impede the feds from accessing whatever data they want to (at their own expense) to make whatever federal arrests they can. Essentially allow the feds to use the tax records to wage total war on California. If prop 19 passes, this is in fact the sequence of events I hope unfolds, as it would be the quickest path to sanity - eventually.