He also wants to make it legal for states to legalize marijuana, despite that fact that he (I assume) would personally oppose the use of marijuana. His persona

He also wants to make it legal for states to legalize marijuana, despite that fact that he (I assume) would personally oppose the use of marijuana. His personal opinion on the particular issue isn't what's motivating him, it's his opinion that it should be up to the states to decide, not the federal government.