<P> Warren Harding's 1922 speech was the first to be broadcast on radio, albeit to a limited audience, while Calvin Coolidge's 1923 speech was the first to be broadcast across the nation . Harry S. Truman's 1947 address was the first to be broadcast on television . Lyndon B. Johnson's address in 1965 was the first delivered in the evening . Three years later, in 1968, television networks in the United States, for the first time, imposed no time limit for their coverage of a State of the Union address . Delivered by Lyndon B. Johnson, this address was followed by extensive televised commentary by, among others, Daniel Patrick Moynihan and Milton Friedman . Ronald Reagan's 1986 State of the Union Address is the only one to have been postponed . He had planned to deliver it on January 28, 1986 but postponed it for a week after learning of the Space Shuttle Challenger disaster and instead addressed the nation on the day's events . Bill Clinton's 1997 address was the first broadcast available live on the World Wide Web . </P> <P> A formal invitation is made by the Speaker of the House to the President several weeks before each State of the Union Address . </P> <P> Every member of Congress can bring one guest to the State of the Union address . The President may invite up to 24 guests with the First Lady in her box . The Speaker of the House may invite up to 24 guests in the Speaker's box . Seating for Congress on the main floor is by a first - in, first - served basis with no reservations . The Cabinet, Supreme Court justices, members of the Diplomatic Corps, and Joint Chiefs have reserved seating . </P> <P> By approximately 8: 30 pm on the night of the address, the members of the House have gathered in their seats for the joint session . Then, the Deputy Sergeant at Arms addresses the Speaker and loudly announces the Vice President and members of the Senate, who enter and take the seats assigned for them . </P>

Where does the first lady sit during the state of the union address
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