Christine2010 posted this info over a year ago....you can send your invite to the White House and they'll send you a beatiful congratulatory card.
Heres the address:
The Honorable Barack Obama and Mrs. Obama The White House Greetings Office, Room 39 1600 Pennsylvania Avenue Washington, DC 20500
or you can fax it to: 202-395-1232
I sent my invite and got their card about a week after we got home from the honeymoon
sorry so blurry! it says : Congratulations to you on your weddig day. We hope this special time is blessed with love, laughter, and happiness. As you embark on your journey together, may your bond grow stronger with each passing year.