I forgot to post the benefits of IRV in my last post:
http://www.instantrunoff.com/Here's answering the question in regards to primaries:
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D) Its results are better. Standard runoffs usually eliminate all but the top two candidates right after the first round. On the other hand, IRV eliminates only the candidate with the current lowest vote count each round (and thus can take several rounds). This makes IRV superior for races in which there are more than three serious candidates, as is often the case in party primaries.
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The IRV works basically as follows: Instead of just casting one vote for one candidate, voters rank the candidates: 1,2,3, etc. (hence, the motto, "it's as easy as 1-2-3."). If no candidate receives a majority of the #1 votes, the candidate with the least total of #1 votes is eliminated. The second choice votes from these ballots are then transferred to the other candidates. The ballots are recounted, and candidates are eliminated in this fashion until 1 winner emerges with a majority of the vote.
snip
**When there are more than 2 candidates, it ensures the winner has a majority. Without IRV, the winner can win with less than 50% of the vote. How do we really know they have a mandate?
**It will allow more candidates, including independents and third-parties, to get involved in a race, without being accused of "spoiling" the elections. Even if your favorite candidate comes in last, at least IRV allows your next favorite candidate to be counted. No more wasting your vote, and no more spoilers.
**It will decrease negative campaigning. To win, candidates need to get some 2nd and 3rd place votes, as well as 1st place votes. They'll be less likely to "go negative" if they need their opponent's voters, too.
**IRV saves money. Some states and local elections hold runoffs weeks later to pick the winner. IRV holds the runoff all in one election--saving money.
That same site also has some other voting methods which might be applicable to the debate question:
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Are there other voting methods like IRV?
Yes, there are several other methods:
Condorcet - this system measures which candidate has the broadest support. It compares each candidate pair-wise with each other candidate.
Borda Count - this is similar to how college football teams are ranked. A first place vote is worth 4 points, a 2nd is worth 3 points, a 3rd 2 points and a 4th is worth 1 point. The candidate receiving the most points wins.
Approval Voting - each voter votes for as many candidates as they like. The candidate with the most votes (plurality) wins. Approval voting only measures whether a candidate is acceptable to the voter; it does not distinguish between a candidate who is intensely liked and those who are more weakly approved of.
Cumulative voting - this system was used in Illinois for 110 years until 1982 to elect Illinois House of Representatives. Voters had three votes to give to three candidates and could distribute the votes any way they wished - all to one candidate, one each, or two and one. There is a push now to revive it. See the Drive to Revive Cumulative Voting.
From another site:
http://www.ghg.net/redflame/irv.htmQUOTE
There are other advantages to IRV as well, such as less sensitivity to campaign spending and more pressure on political parties to nominate centrists. As Polsby and Wildavsky (p. 115) lament regarding the dynamics of modern Presidential primaries,
Where once it was useful to be the second choice of 90% of all delegates, today first choices--even of as few as 30%--are far preferable.
With IRV, second choices are often decisive.
This site mentions that primaries can merge with the general election -- another interesting idea:
http://accuratedemocracy.com/c_irv.htmQUOTE
Moderate candidates get a better chance to win election. We too often see a far-right candidate lead a couple thousand zealous supporters to vote in a primary election, and so win the Republican nomination in a district that always elects that party's nominee. A mirror image may occur in districts controlled by the Democrats. IRV can reduce the chances of that by combining the primary with the general election, greatly increasing the number of Republican voters and independents who help select their party's representative.