I think there are some confounding issues here. First of all, this video was from a time before the utility of medical cannabis was as recognized as it is today

I think there are some confounding issues here. First of all, this video was from a time before the utility of medical cannabis was as recognized as it is today. Secondly there's the issue of Romney's faith. Mormonism is very opposed to the use of consciousness-altering substances, so while he may be considered a moderate (although I would disagree with that characterization), his belief system makes him predisposed to opposing drug reform and freedom of consciousness.