White House statement --
The President today declared an emergency exists in the District of Columbia and ordered Federal aid to supplement the District's response efforts in support of the 56th Presidential Inauguration.
The President's action makes Federal funding available to the District of Columbia.
OK so bureaucratically there's a reason for this. The city may need money to help with all the extra costs. But is this the kind of thing you start thinking about the week before the event? And is this a record for declaring an emergency before a fully predictable event has happened? In another omission, the emergency declaration makes no reference to the already catastrophic traffic.