"All the big [polls] were just catastrophically wrong," said AS/COA's Brian Winter to The Wall Street Journal.
After the October 2 vote, see figures around turnout, congressional composition, and more.
The first-round vote ended with a margin much slimmer than expected between the main candidates, President Jair Bolsonaro and former President Luiz Inácio Lula da Silva.
"[Bolsonaro] clearly outperformed, and that’s a big surprise," said AS/COA's Eric Farnsworth to Al Jazeera.
"Expect an ugly race that will leave scars," said AS/COA's Brian Winter to the Associated Press.
"Ainda acredito que uma vitória de Lula parece provável, mas inevitável? De jeito nenhum", diz Brian Winter da AS/COA à BBC News.
Hear the recording of the conversation moderated by AS/COA's Luisa Leme on the October 2 elections.
