Imperfection Versus Unacceptability in Politics

     Many who oppose voting for a third party candidate do so because, as they argue, voting for a major candidate who is woefully wrong on some issues but who has a realistic chance of winning is preferable to voting for a candidate whose positions are in agreement with one's own but who is has no realistic chance of winning. To them, selecting from the lesser of two evils represented by the two mainstream candidates is preferable to voting third party.  In defense of this position they often point out the inherent imperfection of every human being, thus every political candidate. According to this argument every vote ever cast is for the lesser of two evils, since no human is perfect.