Am I completely blind to be missing all the subtext? I haven't really noticed any of the 'pokes at Democrats or Obama'. The whole thing is really just a variation on the theme of Brave New World, with the aliens trying to control us by giving us what we want. If you're saying it's an allegory for Obama, it seems equally suitable as an allegory for any given politician.
It's pretty subtle, so much so that I'm not even sure if it's even there as I said before: the whole arrival of an outside, foreign force offering "hope" and "change", then being allowed into our nation and lives when they're really trying to undermine America and traditional institutions like the church, the family, and the military....... plus the health care thing.
At least it is not having the leftist bent to the show like so many others on TV these days.
Name one. Actually, you should probably name at least three, since Stargate, 24, and V are all right-leaning, but I'd be surprised if you could find even one. And no, late-night comedy doesn't count: they're as nasty to Obama as they were to Bush.