Obama was in top form at the White House Correspondents' Dinner, cracking jokes about the botched Obamacare rollout, CNN, and even legalized marijuana, which he referred to as an 'interesting social experiment.' You know it's a big issue if he has to address it at the correspondents' dinner, so that's a plus! He even had a pretty witty quip about what he hopes doesn't happen to potheads in Colorado. Check it out for yourself beginning at the 50-second mark: