Obama doesn't care about medical users despite what he said.
http://online.wsj.com/article/SB10001424052748703648304575212382612331758.html?mod=WSJ_article_LatestHeadlinesExcerpt from article:
The reason is simple: If he steps up his pursuit of marijuana growers, his department is eligible for roughly half a million dollars a year in federal anti-drug funding, helping save some jobs. The majority of the funding would have to be used to fight pot. Marijuana may not be the county's most pressing crime problem, the sheriff says, but "it's where the money is."
Washington has long allocated funds to help localities fight crime, influencing their priorities in the process. Today's local budget squeezes are enhancing this effect, and the result is particularly striking in California, where many residents take a benign view of pot but federal dollars help keep law-enforcement focused on it.