This article describes the Global Legislators Database, a new cross-national dataset on the characteristics – party affiliation, gender, age, education, and occupational background – of nearly 20,000 national parliamentarians in the world’s democracies. The database includes 97 electoral democracies with comprehensive information on legislators who held office in each country’s lower or unicameral chamber during one legislative session in 2015, 2016, or 2017. The GLD is the largest individual-level biographical and demographic database on national legislators ever assembled, with a wide range of potential applications. In this article, we provide multiple types of validity checks of the GLD to document the integrity of the data. We also preview three potential applications of the dataset and note other possible uses for this one-of-a-kind resource for studying representation in the world’s democracies.

Classic theories of public opinion suggest that negative shocks can undermine system support in weak democracies, but scant work has systematically assessed this thesis. We identify Peru’s explosive Vacuna-gate scandal as a most-likely case for finding a connection between corruption and political support. The scandal’s unexpected revelation in the middle of the 2021 AmericasBarometer Peru survey created conditions for a natural experiment. Applying an unexpected-event-during-survey design, we consider the consequences of the scandal for perceptions of corruption, system support, and support for democracy. We find robust evidence that the scandal increased even already high perceptions of corruption and lowered system support. Contrary to expectations derived from prior theories, we find no effect on explicit support for democracy. In the conclusion, we discuss the nuanced ways that scandal may shape democratic stability.

Online surveys of public opinion are less expensive and faster to administer than other surveys. However, nonprobability online samples diverge from the gold standard of probabilistic sampling. Although scholars have examined the quality of nonprobability samples in the United States and Europe, we know little about how these samples perform in developing contexts. We use nine online surveys fielded in six Latin American countries to examine the bias in these samples. We also ask whether two common tools that researchers use to mitigate sample bias—post-stratification and sample matching—improve these online samples. We find that online samples in the region exhibit high levels of bias, even in countries where Internet access is widespread. We also find that post-stratification does little to improve sample quality; sample matching outperforms the provider’s standard approach, but the gains are substantively small. This is partly because unequal Internet access and lack of investment in panel recruitment means that providers are unlikely to have enough panelists in lower socioeconomic categories to draw representative online samples, regardless of the sampling method. Researchers who want to draw conclusions about the attitudes or behaviors of the public as a whole in contexts like Latin America still need probability samples.

To what extent has the Argentine party system been polarized along class lines? The political historiography gives mixed and contradictory answers to this question. We explore the social bases of Argentina's political parties using an original database, the most comprehensive database of Argentine elections yet assembled, and new methods of ecological inference that yield more reliable results than previous analyses. We identify two distinct party systems, one in place between 1912 and 1940, the other emerging after 1946. The first party system was not consistently class based, but the second was, with the Radical Party representing the middle classes and the Peronists, workers and the poor. Still, there were important exceptions. Lower-class support for the Peronists, as proxied by literacy rates, declined during Perón's exile, which implies that the party had trouble mobilizing lower-class illiterate voters. Since the return to democracy in 1983, class polarization has again found some expression in the party system.

The conventional wisdom about contemporary Venezuelan politics is that class voting has become commonplace, with the poor doggedly supporting Hugo Chávez while the rich oppose him. This class voting is considered both a new feature of Venezuelan politics and a puzzle given the multiclass bases of prior populist leaders in Latin America. I clarify the concept of class voting by distinguishing between monotonic and nonmonotonic associations between class and vote choice. Using survey data, I find that only in Chávez's first election in 1998 was class voting monotonic. Since then, class voting in Venezuela has been nonmonotonic, with the very wealthiest Venezuelans disproportionately voting against Chávez. At the same time, Chávez's support appears to have increased most among the middle sectors of the income distribution, not the poorest. Finally, I find that whatever effect Chávez may have had on overall turnout, his efforts have not disproportionately mobilized poor voters.