In an election where one feels that one's favorite
Nader has no chance to win, it is
to vote (honestly) for Nader.
Your vote would be "wasted" since your opinions
about the candidates more-likely to win will be ignored.
That could cause both Nader and your favorite frontrunner to lose.
That is exactly what happened in the Florida 2000 US presidential election –
even though studies showed that 90% of the voters who thought Nader best,
dishonestly voted for somebody else, the 10% of Nader-likeing voters who actually did
vote for Nader suffcied to throw the election and make Bush win!