What the......!? only 5k!?
make them wait. Do you know how much news channels and politicians have!? Can you imagine the money that just one politician or news channel would pay for that!? It seems tempting, but my advice is to wait. If they contacted you this early, then they would pay more later. there are more people who dont know about this .mobi extension that would pay more than that.
I would feel the same as you right now if i had that name. But they can wait. Right now, your politics.mobi is worth 5k. Just like bonds, they will only increase in value while you wait. If you had politics.com, would you sell it for 5k? if so, sell. If you think its worth more, keep it.
The world of politics on mobile (anywhere and anytime) is in your hands.