What they sound like! Coalitions of actors who have a common discourse…
See also Advocacy Coalitions, Narrative Policy Framework etc
Hajer (1993) writes of discourse coalitions that validate and/or impose their policy story through the institutionalization of their preferred policy story (p. 47); policy change is theorized to occur when a new discourse, or story, becomes dominant (p. 55).
Shanahan, E. Jones, M. and McBeth, M. 2011. Policy Narratives and Policy Processes. Policy Studies Journal, Vol. 39 (3). pp.535-561.
See work of Harriet Bulkeley (2002) Discourse Coalitions and the Australian Climate Change Policy Network. Peter Christoff is also fond of these.