Brazilian President Luiz Inacio Lula da Silva stunned the world with an election victory that has landed him an unprecedented fourth term in office. Bets were on right-winger Flavio Bolsonaro to become Brazil's next president after his shock first-round win earlier this month. But the leftist incumbent bounced back with an energetic runoff campaign, going on to win 51.8 percent of the vote. How did 80-year-old Lula pull it off?