Comeback kid: How did Brazil veteran-leader Lula upset Bolsonaro?

Two days shy of his 81st birthday… Brazil’s Luiz Inacio Lula da Silva emerging as the comeback kid. Coming from behind in the polls after a bitter campaign where he often showed his age, Lula becoming the first candidate since Brazil’s return to democracy in the 1980s to win the presidential runoff after trailing in the first round. How did the Workers Party leader turn a 2-point-2 million vote deficit against the far-right's Flavio Bolsonaro into a 4-point-4 million vote win? Reminder that three short weeks ago, most races at the federal and state level broke the way of conservatives and the far-right?