Over the last 20 years, I have monitored and collected campaign messages from nearly every country in Latin America. Here are some papers from that agenda:
Scott Desposato. Estratégia Eleitoral com Representação Proporcional de Lista Aberta e Distritos de Um Membro: Subeleitorados e Comunicação Política. In Magna Iná́cio and Lucio Rennó́, editors, Legislativo Brasileiro em Perspectiva Comparada, pages 269–292. Editora UFMG, Belo Horizonte, 2010
"The Impact of Campaign Messages in New Democracies: Results From An Experiment in Brazil": A laboratory experiment on the impact of campaign messages on subjects, conducted in Brazil (Working paper, 2011).
"SMD verus SMDRO rules and Negative Campaigning": A model of campaign tone, and an analysis of campaign tone in Presidential and other elections across Latin America (From ECPR, 2013).
"Explaining Variation in the Quality of Information Provided by Campaigns, with an Empirical Study of Brazil": An empirical look at campaign content from multiple offices and electoral systems (APSA, 2013).
A Slide Deck that Presents an Overview, which was presented at FGV-SP in 2020