So here's what I think could actually pass Congress and be signed into law:

1. Decriminalization of small amounts of marijuana. Dealers still go to jail, users get a ticket and a summons to court. Even Repubs think we have too many blacks / minorities in jail, and it's a huge waste of money. And convicts face substantial hurdles when re-entering the workforce.

2. They'll probably rewrite the corporate tax code. Obama and other Dems have been for this since forever, and this will probably get done. This means they'll lower the rate and eliminate some loopholes.

That's assuming the forthcoming changes to immigration don't cause 2/3 of Washington to spontaneously combust. Other than that, I think the veto pen gets a workout.