In São Paulo and Brasília, campaign posters this week carried two very different last names, yet both pointed to the same divided country. President Luiz Inácio Lula da Silva, seeking to extend a political career that has already spanned three decades, is facing Flávio Bolsonaro, a senator and the eldest son of former president Jair Bolsonaro, who remains in prison following his conviction over an alleged plot to overturn the 2022 election. That the contest has narrowed to a near tie surprises many analysts, who had expected Lula's incumbency to count for more. The numbers explain why neither candidate can yet claim victory.

Under Brazilian law, a candidate must win more than 50% of valid votes to avoid a second round. Recent polling has placed Lula and Bolsonaro within a few points of each other, short of that threshold, which means the two are likely to meet again in a runoff scheduled for October 25. For Flávio Bolsonaro, the race has also become a referendum on his father's legacy; he has cast himself as the candidate who will carry forward a movement that courts remain determined to restrain. The implications stretch beyond Brazil's borders.

As the largest economy in Latin America and a key voice on issues from Amazon deforestation to global trade, Brazil's political direction matters to partners in Washington, Beijing, and across Europe. A Lula victory would likely mean continuity in foreign policy and climate commitments; a Bolsonaro win could herald a sharper turn toward nationalist politics reminiscent of his father's term. Whichever man ultimately prevails, the closeness of the race suggests that the divisions exposed by the elder Bolsonaro's presidency have not healed.