resident Obama was doing his favorite thing this week: talking to crowds of adoring young people who already agree with him while acting like he persuaded them about something. They also seemed to give Obama the impression that he's a really funny guy. On Wednesday, he told a crowd of 1,400 at the University of Michigan that he visited a local deli, Zingerman's. He proceeded to tell a long story about ordering the small Reuben sandwich, which he said was "killer." That description got a good laugh. Then he explained how he thought the sandwich was too big, so he...