Zippy notices that the right thing to do may be to not play the game:
It is possible that, as an objective matter, it is morally wrong to vote for either Obama, McCain, or both in the upcoming presidential election.
I'd like to add that if we could effectively boycott this election, we'd do far more good than we'd do trying to vote in the lesser of two evils. We are going to get evil either way. If the turnout is low enough, the politicians will notice that their livelihood is on the line. It might be enough to get them to stop cooperating with each other against us, and instead start working for us again.