Allan Sloan: Greenspan's public speechifying and op-eds and interviews are viewed in some quarters - including chez Sloan - as undercutting his successor, Ben Bernanke. I don't think Greenspan is trying to undercut the Fed, an institution he clearly loves, but his new punchy public persona frequently overshadows Bernanke. That's a problem, because Bernanke needs every ounce of the Fed's remaining influence and credibility to cope with the seemingly endless problems in the world's financial system.

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