The first is whether Congress would be willing torewritethe tax code as part of the budget reconciliation process, which would foreclose a filibuster in the Senate and allow the chamber of pass a tax coderewrite with just 51 votes.
The expiry of Mr Bush's tax cuts in 2011 offers the opportunity torewrite America's labyrinthine tax code in a way that could be both progressive (as Mr Obama wants) and pro-growth (Mr McCain's concern).
White House officials say Obama is serious about a corporate tax rewrite, but he does not seem prepared to take on the individual revenue code as well.