Didn Greens cost Al Gore the election?
As one of 101 factors, perhaps. What Election 2000 demonstrated is that the United States needs serious electoral reform. The Green Party supports a voting reform called Instant Runoff Voting (IRV), which allows voters to rank candidates in the order of their preference. If your first choice (e.g. Ralph Nader) receives the fewest votes, your vote is transferred to your next choice (e.g. Gore) until a winner emerges with an absolute majority. IRV lets all voters vote their conscience without possibly helping a candidate they dislike. It also saves tax money by preventing the need for separate runoff elections.