The plan is very simple:
Statehood for The District of Columbia.
There are two schools of thought. One holds that it would simply take an act of Congress under Article Four, Section 3 of that quaint piece of paper, the US Constitution. It reads:
Clause 1: New states
New States may be admitted by the Congress into this Union; but no new States shall be formed or erected within the Jurisdiction of any other State; nor any State be formed by the Junction of two or more States, or parts of States, without the Consent of the Legislatures of the States concerned as well as of the Congress.
There is one potential fly in this ointment: Maryland may have the right to claim back the land it ceded to the feds to form the national capitol. Virginia already has. If you look at a map of the District, and then look at the cities of Arlington and Alexandria. Collectively, the three jurisdictions (originally) form a square, which was the original area created for the US's capitol. I'm not sure what the circumstances were way back when in which Virginia took the land back, but I suspect Maryland would not object to statehood for DC.
We have a Democratic president and two Democratic houses of government. This is long overdue. The Lieberman thing is a bonus.
It is a slam dunk that DC would have two Democratic Senators. One would probably be this lady:
Eleanor Holmes Norton