Yes, there's a "Blank" option when voting, and there's also a "null" vote, which happens if you vote for a number that's not in the running (each candidate has

Yes, there's a "Blank" option when voting, and there's also a "null" vote, which happens if you vote for a number that's not in the running (each candidate has a number. For example, in this running Lula is 13 and Bolsonaro is 22). Only valid votes are counted, so whoever gets anything over 50% of the valid votes win.