T he impossible happened. President Luiz Inácio Lula da Silva won a fourth term in Sunday’s runoff election in Brazil, overturning Flávio Bolsonaro’s first-round lead in a historic comeback. No candidate has ever lost the first round and won the second, until now. Grassroots mobilisation, alongside social welfare policies, helped turn the contest into a referendum on Brazilian democracy, rallying voters against a candidate seeking to restore the legacy of his father, Jair Bolsonaro, imprisoned for plotting a coup after his 2022 defeat. Lula’s victory suggests that defending democracy can still be a powerful electoral argument against the ascendant right.

Having already consolidated most of the leftwing vote, Lula had limited room to attract supporters of other candidates after his first-round defeat. His best chance lay in mobilising abstainers and reconnecting with working-class voters.…