Pot legalizers note that he could couch his support in terms of a 10th Amendment argument — essentially saying it should be up to states to decide for themselves. That would allow him to maintain his opposition to legalization while giving a shout-out to social conservatives, who love a good nod to states’ rights.

There’s evidence that the idea of pot legalization is going mainstream — even among Republicans. After all, Pat Robertson endorsed the idea, and approval among voters in recent polls is surprisingly, well, high.