The Post's Wonkblog has a piece reporting on research on Congress. Seems that if one approaches a Congressional office with a request for a meeting, when the participants are "constituents", you are much less likely to have the request granted than if the participants are "campaign donors". This is, of course, a totally surprising result; news which will be buried by the media.
[Update: A modification--the key point is not that the participants donated to the member of Congress, but that they had donated to some campaign. So they could be seen as more active and committed participants in the legislative process. See this interview with the researchers.]
NASCOE has changed its representative on the Hill recently, as they struggle to present their point of view in the budget and legislative battles. Perhaps it's time for them to set up a PAC to make contributions, as money seems to talk much louder than the soft voice of logic.