The purpose of voting is not to elect great men, but to vote the bastards out - PJ O'Rourke.
I have written approvingly of negative voting in the past, and how such voting improves the stability of society. When we look to elect great people, we just naturally ease over into the idea that we want them to do great things. Worse, they get the idea that their job is to do great things. This does not always end poorly - the Interstate Highway System, for example - but the batting average is worse than Carlos Pena's and costs more than his $10M.