
This excellent article on messaging and framing was written by Charlotte Ryan and William A. Gamson of the Movement / Media Research Action Project [3].
"The Movement/Media Research and Action Project’s (MRAP) mission is to strengthen progressive social movements working toward social justice and inclusive, participatory democracy: locally, nationally, and globally."
Links:
[1] http://www.progressivecommunicators.net/en/drupalit/count-vote/76/1
[2] http://mrap.info/resources.html
[3] http://mrap.info/index.html