Somewhere in the labyrinthine corridors of my mind I seem to recall that there is a legal process (at least in Canada) that permits you, during an election, to more or less state your dissatisfaction with the current crop of candidates and not vote for any of them . It wasn’t spoiling your ballot or simply not voting but a defined process that basically amounts to a non-confidence vote (All my voting options are morons, get a new bunch, basically.). Am I mistaken and is there anything like that in the American system?
Not in Canada. You vote for one of the candidates, or spoil your ballot. Spoiled ballots have no effect other than public relations. I vaguely recall reading of some country where “none of the above” was an option and could result in a second election.
When the election seemed to be a cakewalk for the ruling party back in the 80’s, there was a “Rhino Party” that was basically a joke - platform positions like “scratch and win” unemployment cheques. I heard of one election in India where the writes’ union decided to mess up the election and got many of their members to run, such that the ballot in one locale ran to several pages. “Democracies” across the world have combatted those approaches with higher and higher candidate filing fees.
No such process in Canada, either federally or provincially, to the best of my knowledge.
Yeah, I lived in Manitoba during the 80s and voted Rhino. It really is a shame they aren’t still around.
Well, kind of. Nothing stops you from voting in a US election and leaving one of the races blank. This will count as an ‘undervote’ and in most elections an undervote tally will be incremented. Someone could pay attention to that number or not depending on circumstances. I think it can actually have an effect in some races, for instance, someone is running unopposed, but local rules require getting at least 50% of the vote with undervotes counting against you.
As a protest, you can show up, wait in line, audibly ‘harrumph’, not vote for a single race, and record your complete ballot of undervotes. I understand this is not particularly rare.
Aha! I was right; sort of! Manitoba has the option to decline the ballot, Manitoba Elections Act 117(2). Apparently Ontario, Saskatchewan and Alberta allow you to do the same. It’s a shame we can’t do that federally.
Is it bad when I answer my own question? 
Off to look up undervote, a term I’ve never heard of.
In Nevada, and some other states I believe, you can vote for None of these candidates. It does the same thing as leaving blank, and has occasionally won the popular vote.
Yes, you can formally decline a ballot in some Canadian jurisdictions, but declined ballots aren’t counted, which is what I took from your OP.
Spoiled ballots and declined ballots are kept by the deputy returning officers, in case there is a recount - they need to account for every single ballot that they were issued.
But declined ballots don’t count as a “none of the above” option. They aren’t counted at all for the purpose of determining who gets elected, and even if a large number of voters decline their ballots, it has no effect on the outcome of the election in that riding.