Bernanke's challenge clear as Fed officials diverge on QE

St. Louis Fed President James Bullard and Charles Plosser, his counterpart at the Philadelphia Fed, sat on the same panel at a conference here, but sang quite different tunes on what to do about the U.S. central bank's massive bond-buying program.

While Bullard and other more dovish policymakers want to keep buying assets until inflation rises and unemployment drops, Plosser and the more hawkish of the Fed's 19 policymakers want to reduce the pace sooner than later.