Apparently Maranhao voted against the impeachment? How was he chosen, anyway?
He is a Cunha allied. He was the PP's indicated in the Cunha list for the chamber election last year, as the VP of the House.
He was in favour for impeachment, but the fact that Sarney Family (that became enemies) turned pro impeachment made him change sides (besides, the fact that Flavio Dino, Maranhão's Governor, promised to support him for Senate in 2018 may helped).
He can be a infiltrated agent of Cunha too, no one knows.
Well, politics in Brasil looks like everyday less House of Cards and more just like that other series, yes, Lost.