The one election is recent history in which the spoiler effect played the most major role – or at least it is perceived that way by many – was the 2000 presidential election. In case you live under a rock, Al Gore lost Florida to George Bush by about 500 votes and that caused him to lose the Electoral College. Meanwhile, Ralph Nader received over 90,000 votes in Florida and 2.7% nationwide.
Interestingly, Al Gore comments on third parties and the dominance of the two major parties in a recent interview with Digg on Al Gore’s channel Current. In the interview, Gore is actually much more gracious and thoughtful than many of his supporters.
The question begins a bit after one minute into the video, and after the first two questions it changes topic.