Calvin Coolidge actually said...

"I don't know about that. I don't want to make any comment about that."

"I don't know whether Ambassador Herrick will come out here while he is in this country."

"I don't desire to get any heavier and, perhaps, running through the fields may reduce my weight a little."

"I never heard of any such thing and I think it is entirely improbable that such is the case."