Name the new team. The Expos is so Montreal and doesn't fit inside the beltway.
Hey, how about the Washington Beltways! That's a good name, though I think the Washington Insiders may be more appropriate. Washington Bureaucrats also sounds good.
UPDATE: some other names that should be suggested
Special Interets
527's
Lobbyists
Tax & Spenders
Tax Cutters (which, I always prefer)
The Reagans
National Debtors