The president clearly knows better than this:
All that the marijuana question's popularity says about the people who voted for it is that they actually know how to think clearly and independently about drug policy. This is in contrast to Obama who, though he has to be aware that the prohibition of marijuana is even sillier than the prohibition of alcohol, is still willing to parrot the conventional wisdom to maintain the support of the ignorant. And that's not change I can believe in.
So welcome to my long list of political hacks, Mr. President. You're just the latest addition to a long and ignoble list.