Another point, the BMI people claim they support this bill because it helps to bring the copyright laws in line with the copyright laws of "most of the rest of the world"--in fact(as I understand it) there is a clause in this law that is actually in violation of a treaty that the US has entered to with the European Union, and the US is petitioned to appear before the WTO--

As to who speaks for the public domain, as an amicus curiae--I don't think anyone does--