Some countries allow to vote "blank", this means "I want to vote, I disagree with all your candidates/propositions". The "blank" votes are very important to measure, first the number of people willing to vote (blank + non-blank), and also it estimates the number of people who are not represented otherwise by the usual candidates/propositions. That's why I always say to people to vote "blank" if they think unsure or not informed enough. Maybe US should think about having "blank" vote available...