Without intending any offense (because i feel the same way), that's not what those left behind will likely think, and politicians are essentially cowards. They don't lead, they follow what they believe public opinion to be.
As we've discussed before, we need to slowly spread out in our star system, and work from there. I liked EB's idea because i can see, with what we know of physics now, a scenario in which we went out to the asteroid belt to get our materials, and construct a hollow orb the size of a plenetesimal, set it spinning to create an artificial environment of, say, .5 G (one G would be better, though), and then set up on board "farms." We could steal the water from Saturn's rings.
First, though, we have to get out there. I think that's within a reasonable scope, but i also despair of the government and public opinion. Politicians fear monger, and the public will pay for weapons systems faster than space programs. Sadly, i think to myself, not in my lifetime.