According to the Houston Chronicle, one commentator suggests that emerging issues from democratic senators and the complication of Syria attacks are creating roadblocks in the likelihood of Larry Summers becoming the next Federal Reserve chairman. From the paper:

My guess: If the Syria resolution gets approved, Obama will go for Summers. If it's defeated, Obama will punt where he can by picking an uncontroversial Fed nominee. The key question is whether that means Yellen or someone else who might not be as committed to accommodative monetary policy.