Recent August 2026 polls for Brazil’s October 4 first-round presidential vote show incumbent Luiz Inácio Lula da Silva of the Workers’ Party leading at 38–42 percent, with main challenger Flávio Bolsonaro of the Liberal Party at 28–36 percent and other candidates—including Ronaldo Caiado, Romeu Zema, and Renan Santos—collectively in the low to mid-teens. No contender approaches the 50 percent threshold of valid votes required for an outright victory under Brazilian electoral rules. The official campaign period began in mid-August, with voter intentions remaining fragmented amid high mutual rejection between the top two and persistent undecided shares. These patterns align with historical Brazilian elections, where first-round majorities have been rare when the field is split. Trader consensus reflected in the 90 percent probability for “No” tracks directly with this polling stability and the absence of late surges or consolidations that could alter the outlook before voting.