I don't know, i'm no politician; i'm just waiting on the 2008 Obama campaign promise to close Guantanamo Bay (to clarify: I mean cease black operations at that site indefinitely -- I don't have any illusions that the U.S. will stop illegal black operations internationally.).
I don't know whether or not if it's an impossibility at this point to do so; but I also believe if it is impossible it probably shouldn't have been a campaign promise used to influence voters.