Congress's Selective Polarization

Peter Orszag argues that the Postal Service should be privatized.

I wholeheartedly agree. There's really no reason for the government to provide a service that the private sector has demonstrated that it can easily handle (Fed Ex, UPS).

I also agree that if people are worried about service to rural areas, I'd be willing to discuss some kind of subsidy for them only.

I want to draw attention to his opposing arguments, though. He has provided what he believes are the best counter-arguments to his proposal and attempts to dispel them.

Congress could simply unshackle the agency. Legislation is currently pending in both the Senate and the House that would give Postal Service management additional flexibility. In an increasingly polarized Congress, however, it is not clear if or when this legislation will be enacted. And even if it were passed soon, it would probably provide only temporary help. 

Wait, so we can't settle for relaxing the burdens on the postal service through legistlation because the political process is stymied, but how exactly will the postal service be privatized?  Don't we need legislation for that as well?  Will the same political process that is too polarized to provide management extra flexibility magically hold hands and usher through the privatization?