The Honorable Barack Obama and Mrs. Obama
The White House Greetings Office, Room 39
1600 Pennsylvania Avenue
He or she may or may not show up for the big event, but you'll get a note of congratulations from them - a.k.a. a very impersonal letter printed and stuffed by an intern, but still cool. I wonder if it works for Canadian citizens. I found it here.
That great photo of the Obama's at their own affair above found here.