Proponents of Proposition 19, the California ballot initiative that would have legalized recreational use and possession of small amounts of marijuana...
The federal government is going to have limited legal options, at best, if it tries to overthrow the "will of the people" (assuming, of course, that Proposition 19 actually passes), as evidenced best by the fact that the medical marijuana laws still stand.
California legalizing marijuana seems to have become a very real possibility, and how Obama's going to handle it will be important. The state could become a "test-case" in challenging federal laws on the matter.