Back when I was planning my wedding, I remembered reading that you could invite the President to your wedding and he would send back a letter of congratulations in return. So I did that and President Obama sent me a really nice card in the mail. 
sorry for the blurry photo!
When Adele was born, I also sent her birth announcement to the White House and just last week got a nice card back! I’m putting this in her Baby Book for sure! 
If anyone is interested in getting a keepsake like this, you can mail a wedding invitation or birth announcement to:
White House Greetings Office
Room 39
Washington, DC 20500
Good luck!
Kelocity.com 
Wow, that’s so cool. I’ll have to remember to do that.
That’s totally neat! My household is… probably bi-partisan, so I think I’d run into some objections though. But yeah, that’s a totally cute keepsake!