For criticisms of the "Yes" campaign's arguments for AV please see the previous post. Here are eight arguments which in my view put a more positive and rational case for voting "Yes."
1. AV will put an end to the need for negative voting. This is sometimes called tactical voting but "negative" is a more accurate term. It means voting not to put someone in but to keep someone out: for example in the Oldham East and Saddleworth by-election urging Conservatives to vote Liberal Democrat in order to "keep Labour out." Negative voting is a regular feature of FPTP. Even in the bad old days of two party politics thousands of of Conservative votes were cast, not so much in support of Conservative policies as to "keep Labour out" and vice versa.
AV will enable everyone to cast their first preference vote positively for what they really believe in, and their second either for a genuine second preference or to keep someone out. The French do this expensively by holding two elections a week apart. In the first they vote "with the heart", in the second, after minor parties have withdrawn, "with the head" for the realistic choice. With AV we get the two for the price of one.
2. AV will produce a more civilised and rational debate. Parties will be seeking second preference as well as first preference votes, and therefore will not be so rude and scornful about each other or deliberately misrepresent each other. As Ed Milliband put it in last Thursday's Guardian:
"AV will ...force parties to admit where there is agreement between them , prising open our confrontational system so that similarities sometimes become as important as differences...Exaggerating disagreement in order to create black and white choices under first-past-the-post has only added to a particular style of politics that turns off the electorate."
In other words, AV will encourage the politics of co-operation rather than confrontation.
3. Under AV there more seats will become marginal, so the parties will have to campaign to gain the support of a winder section of the electorate rather than a tiny handful of "floating" voters in a small number of marginals.
4. AV will increase the choices open to the elector and therefore the sovereignty of each electorate. We are not forced to give a second, third or fourth preference, but we can if we wish.
5. AV will allow the views of minorities to come to the fore more quickly. For most of the second half of the last century Liberal/liberal Democrat representation was so small that our views could be ignored, so it took fifty years or so for valuable ideas for which we argued way back in the fifties and sixties (devolution to the nations and regions, a stakeholder society,and, yes, electoral reform, to name but three) to be considered in the mainstream. Britain has lost out because of this delay. Today there are other vital minorities struggling for a voice. The Greens are an obvious example. AV will bring their important views to the fore more quickly
6. By encouraging positive voting for a first choice, AV will give a truer reflection of the real opinions of the nation.
7. The House of Commons will be more representative of those opinions.
8. The Commons will become more authoritative, since each MP will have the support of at least half of his or her electors.
Alas I am not a publicist so I have no idea how to sloganise the above or condense it into the 100 word limit required by the Yes campaign website.