Here's a good question
Who was the First President to be addressed in that Manner?
And what was the original form of address?

At first, Washington was properly spoken to as "Your Excellency," I think. I have read that he changed the address to Mr. President. "Your Highness" was also suggested, but Washington apparently didn't like that one.

I also understand Washington was called Mr. President. A term of humility, "Mr." identifies the chief executive as one of the people rather than something loftier.

Perhaps it was just "Mr. Hanson"...

http://www.marshallhall.org/hanson.html

LOL!!! Were this a competition, and not an exhibition, Decal would have just walked away with it.
Nice to see you again, Decal. Your input is missed, and obviously, much needed.

Speaking of Misters - hope the wind doesn't make that skir...I mean kilt...fly up. Great to see you, Deke!

Wonder if they ever called Hanson "Mr President?"