Some analysts say Federal Reserve Chairman Ben Bernanke is nearly guaranteed to be resigning at the end of his current term. His replacement is the topic of speculation, and Vice Chair Janet Yellen is at the top of some lists. "I think she's the No. 1 choice," said Mesirow Financial Chief Economist Diane Swonk. "She's the one that's got the most continuity. She's got a great resume that supports it as well. She's not necessarily more dovish than Bernanke."