Brazilians are casting ballots in nationwide municipal elections that experts say are most important for who won't be taking office.

Sunday's vote is the first under a so-called "Clean Record" law that bars people convicted of crimes from serving.

Observers say the bill is a watershed moment in Brazilian politics, long dominated by strong men who milk the system for personal gain.

Brazil's top electoral court says it's judging 2,969 cases related to the Clean Record law.

So far it's made final rulings on 764 cases — but it has yet to release a list of candidates it has barred.