Brazil votes in knife-edge runoff between Lula and Flávio Bolsonaro

Brazilians are voting on Sunday in a highly unpredictable presidential runoff. Incumbent leftist Luiz Inácio Lula da Silva, 81, is seeking a comeback against far-right senator Flávio Bolsonaro, who won the first round by less than 2% of the vote. The pair go into the contest virtually tied, and Lula's campaign has focused on boosting turnout after record abstention.