Lyndon Johnson actually said...
I, Lyndon B. Johnson, President of the United States of America, on this thirtieth day of April in the year Nineteen Hundred and Sixty-four, do hereby proclaim the ensuing twelve months a period of commemoration of the beginnings of the office of the Presidency of the United States.
Context
Proclamation 3589—Commemoration of the Beginnings of the Office of the Presidency of the United States
04/29/1964