Proponents of sustainable agriculture seek deeply rooted social changes, but to advance this agenda requires political credibility and work with diverse partners. Asthe literature on political co-optation makesclear, the tension between conviction andcredibility is persistent and unavoidable; nota problem to be solved so much as a built-incondition of movement politics. Drawing on acase history of California's largestsustainable agriculture organization, astructural assessment is made of the strategicchoices facing movement leaders, organizationaltensions that accompany these choices, andperceived gains and losses. The case historydemonstrates (...) how movement leaders craft middlerange strategies that adapt to politicalcircumstances while retaining attachments tocore values and constituencies. Thesestrategies are ripe with tradeoffs, placingdemands on leaders who must implement them in aspirit that sustains organizational vitalitywhile broadening political and social impact.But they also enlarge the democraticsensibilities of movement leaders, increasingtheir ability to listen, learn, and forgealliances based on shared goals rather thansimilar motives. (shrink)