Widespread demagoguery

Virginia Postrel thinks McCain is a "demagogic lunatic" for going after the SEC chairman. I agree this was one of McCain's least appealing moments of the campaign. However, if he's demagogic, then so is Obama for running his deceitful ad about immigration. (I'll leave lunacy aside; I think these candidates are engaged in rational, if unpleasant, political calculation.) And that leaves Bob Barr, who's the one candidate to have engaged in demagoguery to my face.