Brazil’s President Luiz Inacio Lula da Silva and his election rival Flavio Bolsonaro are leaving no controversy unturned in their last-ditch efforts to discredit each other and win over voters ahead of Sunday’s nail-biter election. A campaign dominated by scandals and insults has done little to ease the deep political polarisation in Latin America’s biggest economy, one of the last major leftist bastions in the region. The tight race pits Lula, 80, against the son of former far-right president...