i think people are coming around, with studies like this Marijuana and Driving: A Review of the Scientific Evidence - NORML
and so many others, people are beginning to realise that MJ isnt as bad as people made it seem.

also with Cali, new mexico, rhode island, and Connecticut (passed but it was vetoed), and soon new york will be passing the medical marijuana (so the polls say)

eventually enough stated will support medical marijuana use and then its only a matter of time before recreational use is accepted (and even if its not) its pretty clear that states that allow medical marijuana are much more forgiving on recreational marijuana use.

just my 2 cents, feel free to correct me if i got some facts wrong :P