Very important differentiation. The 'grassroots' being attached in S. 2128 are not political grassroots, but policy activist groups like NRA, Family Research Council, taxpayer groups and state think tanks. Go to the "member" section at LobbySense and look at all the groups that signed on. They put it very well that it is about fundamental first amendment rights ... like, speech, assembly, petitioning the government, etc.