Some notes and sources from the episode:

* State of the Union Addresses of the Presidents of the United States

* www.presidency.ucsb.edu/sou.php.

* George Washington's Mount Vernon: First Annual Address to Congress (http://www.mountvernon.org/digital-encyclopedia/article/first-annual-address-to-congress/)

* Franklin D. Roosevelt: Annual Message to Congress on the State of the Union - January 6, 1941.

* The American Presidency Project: www.presidency.ucsb.edu/ws/index.php?pid=16092 (http://www.presidency.ucsb.edu/ws/index.php?pid=16092)

* George W. Bush: Address Before a Joint Session of the Congress on the State of the Union - January 29, 2002. 

* The American Presidency Project: www.presidency.ucsb.edu/ws/index.php?pid=29644 (http://www.presidency.ucsb.edu/ws/index.php?pid=29644)

* George Washington's first state of the union address

* George Washington's Mount Vernon: www.mountvernon.org/education/primary-sources/state-of-the-union-address (http://www.mountvernon.org/education/primary-sources/state-of-the-union-address)

* U.S. Constitution. Art. II, Sec. 3