As the OPM site notes:
This year, the Inauguration Day holiday falls on Monday, January 21, 2013, which is also the legal public holiday for the Birthday of Martin Luther King, Jr.
We certainly won’t provide as much coverage as the historic first one, but we can feel the excitement, and might even go this time.
Our first tip is that Metro has announced you can preorder the Commemorative SmarTrip Card. The Metro transit shop in Old Town/King Street will carry them in mid-December.
The reusable plastic card comes pre-loaded with a One-Day Pass that provides unlimited travel on Metrorail on the day it is first used.
Each commemorative SmarTrip® costs $15 - just $1 more than the cost of a regular one-day pass and $4 less than the cost of purchasing a SmarTrip® card and One-Day Pass separately.
As an added bonus, your commemorative SmarTrip® can be used as a "flash pass" for unlimited Metrobus travel on Inauguration Day. Once the One-Day Pass is used, you can reload your commemorative SmarTrip® card just like a regular SmarTrip® card.