Null Votes

In Brazil, with the growing unhappiness derived from the various political scandals that always result in no punishment to the people involved, people more and more want to find a way to vent their frustration.
This has resulted in a campaign for the null vote. While I agree in part, it is not for the reason that is posted in an email circulation brazil defending the null vote. There they state that 50% plus one vote will lead to the voiding of the whole election process. The brazilian electoral code clearly states in article 219-224 that this is not the case, and it is very clear that null votes simply are not considered for the elections. The president is determined by the majority of the valid votes, and null and blank votes are not valid. So if you get an extreme case where 99% of the votes are null or blank, then the president will be elected on the majority of the 1% of votes left.
OBS:In Brazil we vote using an electronic device that is the same throughout the country. To vote null in it, one must type a number that does not belong to a candidate such as 99, and the confirm it.
To the law, a null vote is a misvote, meaning somebody made a mistake while voting, it is not considered a protest.
But the reason I do support the null vote is that even though it will not be considered, an election won with a high number of null votes, will somehow show the general insatisfaction