Well, he didn't send in the stormtroopers to crush it in Colorado or Washington like any republican most assuredly would have.
He didn't even generate hardly any anti weed propaganda when the 2 states were in the process. He even referred to it as "an important experiment."
It must just be really easy for smaller minds to hate Obama. He's on a higher level of chess and light years above the garbage republican/blue dog congress he has been cursed to have obstruct him during his term.
People that can't see what he has done in the face of the worst congress and supreme court in history are blind, misinformed, or just haters.