The President of the United States

The President of the United States
On the Envelope: The President Salutation: Dear Mr. President Oral Address: Mr. President/Sir Place Card on a table: The President If you are invited to dinner: The proper way to accept is to send a hand-written acceptance in this form: -
Mr. and Mrs. [Full Name] have the honour to accept the kind invitation of The President and Mrs. Obama to dinner Wednesday, June Thirteenth seven o'clock The White House
Yes, you should spell "honour" that way. [Photo via]
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