I partially agree. I think not voting is a vote for whichever candidate you like the least, since if you had voted somewhere else, the candidate you like the least would have gotten a smaller percentage of the votes. If you want to cast a blank vote, vote for whichever party would do the least damage., since that will actually have a measurable outcome. If you think all candidates are equally bad, including 3rd party, I think voting for someone who has some level of cultural relevance and holds the same views you do makes the most sense, since that makes the statement that you would vote for candidates like that person.