The Berlin Wall of pot prohibition seems to be crumbling before our eyes. By fully legalizing marijuana through direct democracy, Colorado and Washington have fundamentally changed the national conversation about cannabis. As many as 58 percent of Americans now believe marijuana should be legal. And our political establishment is catching on. Former president Jimmy Carter came out this month and endorsed taxed-and-regulated weed. "I'm in favor of it," Carter said. "I think it's OK."