Earlier quoted context omitted.
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It is not clear from that article how one is to distinguish intentional non-voting from apathy. It seems to me that if one wishes to make a statement of their non-vote, they need to go to the poll and submit a blank ballot, not just stay home on election day. That may be the idea here, but the article doesn't actually seem to say so. EDIT: a bit more looking around turned up https://en.wikipedia.org/wiki/Protest_vote…
a) "None of the above" is officially reported as part of the election statistics, distinguishing itself as a protest vote, compared to spoiled ballots which might be for other reasons.
b) If "none of the above" wins, they have to hold the election again, but all the current candidates are prohibited from standing.
What I think this will do is promote positive voting. At the moment a lot of voting is negative - to stop the worse candidate from getting in. If "none of the above" becomes an option, the candidates may all be deselected. Each one is therefore encouraged to explain to people why they are a positive choice and not just the least worst.