He would receive about as much support as Ross Perot or Ron Paul, guaranteeing a D win.
He would be much better served in a Governorship in his homestate of Michigan. Clean up Detroit, balance the budget and do what he can for Michigan.

But as an "Amateur" Pollytickian, I don't see how he could do any worse than the Halfrican we currently have in the office.
We know that our troops would be respected and a sense of exceptionalism would return to the nation.