Image from Letters of Note, as spotted on Neither Snow.
Say what you will about The President, but I think anyone who takes the time to write an unsolicited thank-you note - and for an indirect gift at that - is a lovely person (especially if the person who is writing happens to be one of the busiest people in the world!).
Above, a note from #44 himself to Canadian author Yann Martel. President Obama read Martel's book, The Life of Pi, with his daughter and then penned a handwritten note, which included this sentiment:
"It is a lovely book — an elegant proof of God, and the power of storytelling. Thank you."