JFK's Second State of the Union Speech May 25, 1961
"..this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the Moon and returning him safely to the Earth."-http://www.luminet.net/~tgort/moon.htm
"We propose additional funds for other engine development and for unmanned explorations"
"Secondly, an additional 23 million dollars, together with 7 million dollars already available, will accelerate development of the Rover nuclear rocket. This gives promise of some day providing a means for even more exciting and ambitious exploration of space, perhaps beyond the Moon, perhaps to the very end of the solar system itself."
This set the spending priorities for the decade, huge funding for Saturn (ISP 3-400), medium for Rover(ISP 800), small for Orion(ISP 4-12,000).