Here’s James Pethokoukis:

The next head of OMB will need 24-carat credibility and authority. The president’s confidence won’t be enough. A potentially more Republican Congress will be needed to pass any fiscal austerity reforms recommended by Obama’s deficit panel. And voters will need to understand those painful fixes, while U.S. bond and currency investors will need to believe they’ll really happen.
One option would be a disciple of Bill Clinton, the last president to balance the budget. A bolder choice would be David Walker, the government’s former chief auditor. He now runs a foundation created by Blackstone Group co-founder Peter Peterson devoted to fiscal sustainability issues. Walker is a fire-and-brimstone preacher on the deficit, albeit one with a penchant for folksy aphorisms. He could both crunch the numbers and communicate them. But given the magnitude of the challenge, getting him might take some convincing.