Nearly 159 million Brazilians vote Sunday in a presidential runoff that has no modern precedent: never since the return of democracy in the 1980s has the first-round loser managed to reverse the result. Luiz Inácio Lula da Silva, the 80-year-old incumbent, trails Flávio Bolsonaro after losing the first round 45% to 47%, and tens of thousands packed Copacabana beach Saturday in a last-ditch attempt to bend history. The structural dynamic here is not left versus right — it is democratic continuity versus dynastic restoration. Jair Bolsonaro, Flávio's father, is serving a 27-year prison sentence for plotting a coup after losing the 2022 election to Lula. Brazilian press reports suggest that a Flávio Bolsonaro administration would install several of the elder Bolsonaro's fellow coup plotters — now imprisoned or in exile — in top military and police positions. The election is, in effect, a referendum on whether to reverse a criminal conviction by electing the convict's son. Flávio Bolsonaro has built his campaign on a simple proposition: tackling Brazil's chronic violent crime with an iron fist. His father relaxed gun ownership laws during his 2019-2022 presidency — a policy that security experts say diverted many firearms to criminal gangs. Lula tightened those regulations. At a Bolsonaro rally in Belo Horizonte, the capital of bellwether Minas Gerais state (where Bolsonaro led by nearly 5 points in the first round), supporters waved American flags alongside Brazilian ones and AI-generated funk carioca tracks praising the candidate boomed through the plaza. Lula's late-stage momentum is real but may be insufficient. A succession of scandals has damaged Bolsonaro in recent days: Piauí magazine reported that during the 2020 Covid outbreak, Flávio Bolsonaro attended a boat party with sex workers and vaccine lobbyists seeking government deals. A 10-million-member WhatsApp group called "Lula's Army" was created after the first round to coordinate voter persuasion — a grassroots mobilization infrastructure operating outside traditional media channels. The Covid wound remains politically potent. At the Copacabana rally, restaurateur Marta Moraes said she lost four family members due to the elder Bolsonaro's pandemic neglect. The emotional resonance of this argument is undeniable, but polls still show the race effectively tied, with most analysts giving Bolsonaro a slight edge. Minas Gerais is the canary. With Brazil's second-largest electorate after São Paulo, no presidential candidate has ever won the presidency without carrying it. Bolsonaro's first-round lead there of nearly 5 points is the structural advantage Lula's Copacabana spectacle must overcome — and street rallies, however massive, do not reliably translate into ballot-box reversals. The 20-year question is whether Brazil's democratic institutions can survive a cycle of imprisonment-then-restoration. If a jailed coup plotter's son can win the presidency and appoint the plotter's allies to security positions, the coup attempt retroactively succeeds. The precedent would not be lost on future aspirants across Latin America.