Ron Paul is definitely not the man to enact medical marijuana legislation. Ron Paul is so extreme right, that it intersects with the the extreme left on certain issues and causes confusion. Ron Paul would oppose giving the federal government more power to enact laws.

As for the candidate most likely to enact medical marijuana legislation....that's rephrase that because there are going to be no allies. But if I had to bet, it would be Obama by a hair. Not more likely to do than Hilldog or McCain.