Ah, now there???s the rub.In March, Senator Jeff Bingaman (D, N.M.) introduced the Clean Energy Standard Act of 2012, which identifies natural gas and nuclear ??? along with renewable energy sources ??? as being ???clean.??? If that definition holds, then groups such as the Sierra Club, Greenpeace, and lots of others will be in the rather uncomfortable position of having to oppose Bingaman???s mea