Doesn't he already have a job?

Political Wire: Romney Considered to Lead Katrina Recovery:

'As the White House gears up for the massive job of rebuilding hurricane-stricken areas, there's been talk of bringing in someone like' Massachusetts Gov. Mitt Romney (R) 'to oversee the project. And CBS4 News has learned there may be more to that than just talk.'

Doesn't he already have a job? Further, doesn't this undermine the respective governors of Mississippi and Louisiana? Romney is, after all, their peer in that regard. I don't get the logic behind this. Shouldn't the reconstruction "czar" be someone who can give the job their complete attention? Jack Welsh? Colin Powell? Someone who doesn't already have a job?