Back to the expat thing, I have had the experience of talking to Americans back there who know I've been living abroad for a very long time, tell me they don't consider me an American anymore. Yes of course you can (with difficulty) give up your citizenship, but American citizenship may be the stickiest citizenship there is. It's hard to imagine a U.S. senator being so stupid as to think or suggest moving abroad equals no longer being a U.S. citizen.
Yet the polls are close.