The 2015–2019 left-wing government alliance in Portugal deserves close attention for four reasons:

• It could point to a way for beleaguered social-democratic parties to move back to the left.
• It may have given the radical left meaningful influence over government policy.
• Most existing overviews of the Portuguese case are descriptive rather than analytical.
• The few analytical and explanatory studies that exist are limited in scope.

📊 Evidence: Empirical Data on the 2015–2019 Alliance

Uses empirical data to provide a comprehensive, analytical, and explanatory account of the Portuguese left-wing alliance. Rather than presenting only descriptive narratives, the study systematically examines coalition patterns and shifts in party policy orientations during the 2015–2019 period.

⚖️ Key Findings: Crisis Shaped Coalitions and Policies

• The 2010s crisis was a critical factor in altering longstanding patterns of left-of-center coalition politics in Portugal.
• The crisis helped bring the Socialist Party and radical left parties into government together, creating new coalition dynamics.
• Those new dynamics mattered for policy: interactions within government steered Socialist Party policy orientations leftward.
• Overall, the rise of new coalition patterns and increased radical-left influence provided a plausible pathway for renewing and rejuvenating social-democratic parties.

🌍 Why It Matters

Findings suggest that coalition innovation under crisis conditions can reshape established party behavior and offer a model for social-democratic renewal in Portugal and potentially beyond. The study fills a gap in the literature by moving from descriptive accounts to a broader empirical, analytical, and explanatory treatment of left-wing coalition politics.