From crisis activation to failed adaptation: SYRIZA and the durability of challenger parties

This article explains how a historically embedded challenger can convert crisis mobilisation into governmental power and why that breakthrough may not endure. Using theory-guided process tracing, it reconstructs SYRIZA’s trajectory from 2008 to 2023 using electoral data, surveys, party documents, institutional records, and research on movements and media. Five mechanisms organise the analysis: crisis activation of inherited resources; party, movement, and media connection; electoral expansion and organisational transformation; governing reversal and organisational separation; and adaptation and differentiation after crisis-centred competition. SYRIZA’s rise depended on activating pre-existing resources and translating austerity grievances into representative credibility. Its decline resulted from the interaction of the 2015 governing reversal, weakened organisational relationships, incomplete credibility repair, and insufficient differentiation once bailout politics lost electoral centrality. Comparisons with Podemos, the Five Star Movement, and La France Insoumise indicate that challenger durability depends on organisational renewal, the management of compromise, and adaptation beyond the founding grievance.