Hi Broc! Good to see you.
I'd send the card straight to the President at the White House.
This is from the White House website:
Write a letter to the President
Here are a few simple things you can do to make sure your message gets to the White House as quickly as possible.
1. If possible, email us! This is the fastest way to get your message to President Obama.
2. If you write a letter, please consider typing it on an 8 1/2 by 11 inch sheet of paper. If you hand-write your letter, please consider using pen and writing as neatly as possible.
3. Please include your return address on your letter as well as your envelope. If you have an email address, please consider including that as well.
4. And finally, be sure to include the full address of the White House to make sure your message gets to us as quickly and directly as possible:
The White House
1600 Pennsylvania Avenue NW
Washington, DC 20500