this blog post on Gwenniepie waaay back when I first got engaged about mailing an invitation to the White House and saved the post for when I actually mailed our my invitations!
I googled "mailing a wedding invitation to the White House" and found the proper way to address the invitation at YourWeddingplace.com:
How to invite United States President to your wedding:The Honorable Barack Obama and Mrs. Obama
The White House
Greetings Office Rm. 39
1600 Pennsylvania Ave.
Washington, DC 20500
The white house will send back an "official" regrets reply if you send them an invitation! Certainly something for the scrapbook and a little keepsake of the year you got married.
So look out for your invitation President Obama...oh and also: We are registered at Bed, Bath and Beyond and William Sonoma! Just in case you decided to send us a gift!
Will/Did you invite the President to your wedding?