Columbus wouldn't have sailed to the New World if it hadn't been for Queen Isabella's funding.
Let's not forget Thomas Jefferson, usually touted by the uberConservatives as one of our greatest Presidents (and I concur). He pulled some questionable antics to gather together government money to fund the Corps of Discovery. If one were cynical enough, one could tear apart his motivations.
As I said earlier, government funding and support for exploration goes back a long as the country itself. So there is quite a bit of precedent.
I propose an independent outpost be established on Mars to be accomplished by the year of our Lord in 2010. Think it can't be done? Think again.