Don’t be suprised if the current version of the appropiations bill has this stuck into it.
And, Federal legislation is a much harder thing for a President to break, should we win in 2012. So, even if the treaty does pass, if a piece of legislation is passed by the House and Senate, and signed by the President, it would make it that much harder for a future President to break the treaty as it will also be Federal law. Presidents can break treaties at will, but not regular legislation. And, the Dems would include such a poison pill to hamstring a future administration.
No, a Treaty is almost impossible to break without grave geopolitical consequences. Legislation is a comparative cake walk.