During Tuesday's "Potomac Primary," reason Associate Editors David Weigel and Michael C. Moynihan, accompanied by reason.tv videographer Dan Hayes, interrogated voters at a Washington, D.C. polling station about who they cast their ballots for and why. Our unscientific reason.tv exit polling hewed pretty close to the actual results: An overwhelming majority of District voters have converted to the Church of Obama. Almost without exception, our interviewees cited the...