[cloudjacker]

There is one paper worth reading, I was able to retrieve it from sci-hub:

http://sci-hub.bz/10.1146/annurev-polisci-100711-135308

tl;dr The most effective lobbying groups are typically supported is heads of large organizations acting independently of the rest of the organization or actual people. Estimating effectiveness has challenges in an empirical study but here are our attempts anyway.

There is another paper that shows the outcomes of public policy issues that stirred public interest. I want to find that one.