Plosser, who has been president of the Fed's Philadelphia regional bank since August 2006, has been a leader of the officials known as hawks for their concerns that a continuation of low-interest rate policies could ignite inflation. The worry that a result could be runaway inflation or dangerous asset bubbles like the one in home prices that triggered the last recession. Yellen enjoys broad support among other Fed officials who tend to think the risk of inflation remains low and that the greater threat to the economy comes from subpar growth and a still less-than-healthy job market.