How Progressive Catholic Bishops Boosted Brazil’s Workers’ Party

Why This Matters

Religious influence in elections is often assumed to be conservative, and left-wing parties are frequently described as secular. Guadalupe Tuñón challenges that conventional wisdom by showing that the redistributive beliefs of religious leaders can make them important allies for the left — with real consequences for party-building and electoral outcomes in the developing world.

The Puzzle and Argument

Tuñón asks when and how religious leaders help left-wing parties win votes. The core claim is that bishops who publicly supported state-led redistribution and social justice became valuable local advocates for the Workers’ Party (PT) in Brazil, shifting the common expectation that religion uniformly favors conservative politics.

Natural Variation in Bishop Exposure 🕊️

The paper exploits as-if random variation in how long municipalities were exposed to progressive Catholic bishops after the appointment of Pope John Paul II. By comparing municipalities with differing lengths of exposure to these bishops, the study isolates the influence of bishop-backed redistribution messages on local voting behavior.

What Was Measured

• Exposure: duration that a municipality had a progressive, redistribution-supporting bishop in office.
• Outcome: electoral support for the Workers’ Party (PT) at the municipal level.

Key Findings

• Municipalities with longer exposure to bishops who actively endorsed state-led redistribution recorded higher vote shares for the PT.
• These progressive bishops appear to have been critical local actors in building PT electoral strength, indicating religious leaders can facilitate left-wing mobilization.

Why It Matters for Comparative Politics

The study highlights a neglected channel through which religion shapes politics: clergy preferences about redistribution can realign religious influence toward the left. This finding matters for scholars of party development, religion and politics, and Latin American electoral behavior, especially in contexts where religious institutions remain locally embedded and politically salient.

Implications for Future Research

By documenting a clear case in Brazil, Tuñón opens questions about when similar dynamics operate elsewhere and how religious organizational structures mediate clergy influence on party politics.