New Delhi, Oct. 6 -- Brazil, the world's fourth-largest democracy and home to about 60% of the Amazon rainforest, voted Sunday for president, Congress and governors. The presidential race remains undecided, with Sen. Flavio Bolsonaro, son of former far-right President Jair Bolsonaro, set to face President Luiz Inacio Lula da Silva in an Oct. 25 runoff.

Bolsonaro's Liberal Party won about a third of Senate seats and nearly a quarter of seats in the Chamber of Deputies, making it the largest party in both houses.

"The elections have already produced a significant shift in Congress," Amazon Watch, a nonprofit focused on environmental protection and Indigenous rights, said in a statement. "The new balance of power strengthens groups that su...