@Finn dAbuzz,
We don't have the option of refusing a ballot and having that noted and counted. That makes more sense in places where voting is compulsory. I'm not sure we need to do that here, people can just not turn out to vote--low turn out reflects public sentiment too.
It almost never happens that people enter a voting booth, or hand in a paper ballot, without casting a single vote for any office or proposition. When that does happen, it throws the count off, and, if many people did it, it would suggest some irregularity in the voting process because it would register as more people voting than the total number of votes cast, for any office. So, I don't think it's an effective method of protest for people here to leave a ballot totally blank. I'm not even sure if some of the new computerized voting methods, where the ballot is scanned into a machine, would accept a totally blank ballot or whether they would read it as an error and just reject it.
I can't ever remember disapproving of every single candidate, for every office, on a ballot.
To refuse the ballot, or to refuse to vote for at least one office on the ballot, I think, is a rejection of the democratic process rather than just the slate of candidates.