With just two days to go before the first round of Brazil's presidential election, artificial intelligence is taking centre stage, whether it's a deepfake avatar of former president Jair Bolsonaro to support his son's candidacy, or an AI-generated working-class female voter criticising President Luiz Inacio Lula da Silva. According to the Brazilian intelligence agency, disinformation will be one of the main challenges of this election. Our correspondents report.