Lyndon Johnson actually said...
I want to ask each of you to pledge yourselves this morning to go out for the next 4 weeks, for the next 30 days, and contribute your time and your talents and your energy to your country by supporting Gus Johnson for Congress and Lyndon Johnson and Hubert Humphrey for the Presidency and the Vice Presidency.
Context
Remarks at the Station in Alexandria, Va., at the Start of Mrs. Johnson's Trip Through the South
10/05/1964