Posted May 07, 2011
wpegg: No, its strength is that it always results in the first most popular candidate winning, its failure is that it means that the parties on a national level are disproportionately represented.
choconutjoe: That depends how you define 'most popular'. The candidate with more votes than any other single candidate can still be the least popular candidate. Say there are 5 candidates: A, B, C, D & E. Candidate A gets 25% of the vote, and the others get around 19% each. Under FPtP, A would win, even though 75% of the voters voted against them. It could easily be the case that everyone who voted B, C, D or E would rather have anyone other than A, in which case A would win despite being the least popular candidate.
The disproportional representation at a national level is a side-effect of this (and other things).
The power for a group of people to have an anyone but him vote as well as their vote is not a good justification for AV. First past the post does elect the favoured candidate of the region. However it does also waste the votes of others, the advantage of AV is that while the regional votes would be unrepresentative at times, the overall smoothing effect would lead to a more proportional govenment. It's a rubbish comprimise, as Nick Clegg was right to say - because it really is, but it would be an unstoppable move towards a decent system.