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In this analysis
Brazil votes on 4 October with President Luiz Inácio Lula da Silva expected to lead the first round but without a guaranteed majority. Senator Flávio Bolsonaro has consolidated the conservative vote and polling points to a competitive second round on 25 October.
The presidential contest is the visible struggle. The more durable transfer of power may occur in Congress, where two-thirds of the Senate is being renewed alongside the entire Chamber of Deputies.
A close presidency can coexist with a decisive legislative shift
Reuters reported that Lula and Bolsonaro enter the vote with high rejection and a narrow prospective runoff. That encourages both campaigns to describe the election as a binary national choice. Yet Brazil's fragmented party system rarely gives a president an automatic governing majority.
A stronger right and centre-right bloc in the Senate would influence confirmations, investigations, constitutional amendments and the political environment around the Supreme Federal Court. The effect could persist even if Lula wins another term.
Bolsonaro politics has outlived Bolsonaro's eligibility
Jair Bolsonaro is barred from running after his conviction for plotting to overturn the 2022 election result, but his movement remains electorally organised. His son's campaign shows that personal disqualification did not dissolve the coalition of conservative voters, evangelical networks, security politics and anti-Lula identity.
That succession also changes the movement. Flávio Bolsonaro must translate inherited loyalty into his own authority while avoiding complete dependence on his father's grievances. A strong congressional result would give the family project institutional depth even without the presidency.
Foreign pressure can harden domestic alignments
Lula has warned about US interference and new tariffs, while Donald Trump has attacked the prosecution of Jair Bolsonaro. External involvement may mobilise each side's base, but it can also reduce room for the next government to manage trade and diplomatic disputes pragmatically.
Brazil's scale means the result will affect Latin America's broader ideological balance. A conservative victory would extend the region's rightward movement. A Lula victory with a more conservative Congress would produce a different outcome: continuity in the presidency combined with constraint in the institutions.
The count should be read across three maps
The first map is presidential, including whether either candidate can avoid a runoff. The second is the Senate, where the number and cohesion of right and centre-right winners will shape institutional power. The third is gubernatorial, because governors control political machines and influence congressional coalitions.
State & Power's assessment is that the election should not be reduced to Lula against a second-generation Bolsonaro. Brazil may emerge with divided legitimacy: one camp holding the presidency, another gaining the institutions that set the limits around it.