Mathematically speaking, it’s half-vote for Obungle. But I hear you.
Cripes. You've got your election math scrambled six ways to Sunday.
"Voting against" and "half votes" are both sophistries.
For heaven's sake, get a grip and lose the emotion-fueled mathematical rationalizing in order to demonize those who refuse to vote the same as you.
There's only one way to vote for a candidate, and that's to mark his name on your ballot; there's only one way to vote for authoritarian tyranny, and that is to vote for a politician who promotes it.
It is SIMPLE ARITHMETIC.