Is the Larry Summers nomination falling apart?

This time a week ago, the nomination of Larry Summers to be the next chairman of the Federal Reserve seemed like a near-certainty. The signals out of the White House were that the president had largely made up his mind and that the administration was biding its time on the details of a rollout. Now, it is becoming clearer the type of fight President Obama will face, including within his own party, if he moves forward.