Some notes and sources from the episode:

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• State of the Union Addresses of the Presidents of the United States
  
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  • www.presidency.ucsb.edu/sou.php.
    
  
  
  
• George Washington's Mount Vernon: First Annual Address to Congress
  
• Franklin D. Roosevelt: Annual Message to Congress on the State of the Union - January 6, 1941.
  
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  • The American Presidency Project: 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. 
  
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  • The American Presidency Project: www.presidency.ucsb.edu/ws/index.php?pid=29644
    
  
  
  
• George Washington's first state of the union address
  
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  • George Washington's Mount Vernon: www.mountvernon.org/education/primary-sources/state-of-the-union-address
    
  
  
  
• U.S. Constitution. Art. II, Sec. 3