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But, time will tell. Look at it this way: marijuana production DOES contribute to the nation's economy, like it or not.
It's a multibillion dollar business even before you factor in legal representation of violators of the law and the infrastructure supporting their subsequent punishment & incarceration.
Obviously if he came out tomorrow pushing legalization this would polarize the country, which probably would not be productive given the other work that needs to be done.
On the other hand, being so blithely dismissive of what seems to have been one of the biggest questions posed online does not endear Obama to a lot of folks who are looking for substantive (no pun intended, well ok, maybe a little) change in this country.
He could have taken this question a little more seriously and still not damaged his psuedo-centrist street cred...