Lyndon Johnson actually said...
As a tribute to the professional photographer and in recognition of the importance of professional photography in our life today and in America's future, the Congress by a point resolution approved March 29, 1965, has requested the President to issue a proclamation designating the week beginning May 2 through May 8, 1965, as Professional Photography Week.
Context
Proclamation 3649—Professional Photography Week
03/28/1965