But that matter of time could take 20 years. Most people still are ignorant and think of pot they way they were told to think. All kinds of predjudice and bias and EVERY INDUSTRY IN THE WORLD will fight it. Lawyers, judges, police, corrections, private prisons, plastics, paper, wood, fuel, big pharma, even growers and dealers and all those folks who make a good living on the illegaility of it many won't support and will fight legalization.
Everyone is scared shitless and obama can't go all the way in one step. It just won't happen. Look at who the vice pres is and what he has done to push the war against pot. (more about pot than other drugs)