http://ec.europa.eu/commission_barro...n/index_en.htm
Peter Mandelson's website. Incl contact options. This is the guy who will be taking on the US over this. The guardian article says that the EU firms have not complained formally yet. It will strengthen his hand if US consumers complain about this - in particular the higher rake of B&M casinos. Make it clear that you want to use EU based firms (poker and sports betting)and that you believe this bill is protectionism in breach of WTO.
EU based affiliates may want to ask about registering a complaint as effectively you are locked out of the US market.