Ah, but you see, by voting you, we'd really be not voting you, in fact subtracting from your total votes, and thus ensuring victory to your opponent. So we'd have to vote against you. However, this can't be trusted to happen every time, and indeed at least on some occasions the machines have proven themselves at least partially accurate, meaning that to really be sure that we'd voted for you we'd have to take advantage of the multiple-vote security hole and vote once for you and once against, which in the end would leave us just where we'd be if we hadn't voted at all- meaning that only voting by not-voting has any real promise of showing a proper outcome.
Wow, voting has become so Zen.