Flávio Bolsonaro maintains a commanding lead in trader consensus for second place in Brazil's October 4 first-round presidential vote, driven by Jair Bolsonaro's December endorsement that unified much of the right-wing electorate behind the senator from the Liberal Party. Recent national polls, including those from Quaest and Ideia in early May, place Lula in the mid-to-high 30s percent while showing Flávio in the low-to-mid 30s, well ahead of fragmented challengers such as Ronaldo Caiado, Romeu Zema, and Renan Santos, each below 6 percent. This positioning leaves limited room for other candidates to overtake him absent major consolidations or withdrawals. A mid-May leak of messages tying Flávio to a banking scandal has introduced short-term volatility, yet the market continues to price his established base and opposition role as durable factors for the second spot.