Lyndon Johnson actually said...

"We must let them know, and we must let the world know, that we are willing to bear the burden of a long struggle to defeat the Communist invasion of South Vietnam."

"You will see, I think, why I think that domestic policy is a good guide to our foreign policy and what we should do abroad."

"Our safest guide to what we do abroad is always take a good look at what we are doing at home."

"We defend, and I intend to defend, the right of everyone to disagree, if he wants to, with everything that we urge or everything that we do."