I must forcefully disagree! We should ship the liberals to harsh, inhospitable planets.
Personally, I'd just as soon leave them here, while we boldly go forth to plant the seeds of the American culture of liberty on the new worlds.
It's a win-win proposition. They will be more than happy to see us go, and we'll be more than happy to leave them to their own totalitarian socialist devices.
And won't their descendants be surprised, when 1000 years or so into the New Dark Ages (otherwise known as the "Radiant Socialist Future" LOL), our descendants return to the mother world in what will seem to the inhabitants of old Earth to be "magical fiery chariots".
I wonder if our descendants will take pity on the stay-at-homes living in the filth and squalor of a depleted world, and help them out. (Hopefully NOT)
Heh heh. I'm getting away from myself - this idea is actually the basis for a series of science fiction short stories I'm in the process of creating right now. Some of the fundamental details are different, but it's the gist of it.