You do realize there are plenty of undervotes in all elections, right? Sometimes you can't hope to find out enough about a candidate (a judge, for example) or find not a dimes bit of difference between the candidates or you only had enough time to study some issues and candidates but not all so you decide not to vote because you believe an UNINFORMED VOTE is a bad thing.
"...there are plenty of undervotes in all elections..."
Historically, undervote rates in the USA have never varied beyond a range of 1-3%. Electronic 'voting' systems, however, have produced undervote rates many times higher than that, even up to 70-80%.