John Kennedy actually said...

"This is a great country, the United States, but it can be a greater country."

"I welcome the support of the working men and women of this country."

"I want to express my thanks to all of you for coming down to this airport to meet us."

"I take our case to you because I am confident that you are willing to do whatever has to be done to make us first in the world militarily, and thus first in the fight for peace."