There are actually 5 factions in Israel: Arab, Left, Centre-Left, Centre-Right, Religious Right. There has been a fundamental shift away from Labour and its leftist allies.
This kind of proportional voting would not work in the US where voting is done by congressional district, not a list, but I do like the option that is in place in New York State. In New York, a candidate can seek the nomination of more than one party. It’s not uncommon to have a Republican also on the ticket as a Conservative Party candidate and Right to LIfe Party candidate, while the Dem candidates are often also on the Liberal Party ticket. This way you can show your support for a particular element of the Republican coalition or, if the GOP nominates a liberal, you can vote for a different candidate entirely. It would be great if on a national scale you could register a vote for your Republican candidate by voting on the Tea Party ticket, or Right to Life, or Second Amendment, etc.. At least this way there would be no doubt that the Republican’s victory was the result of voters who felt strongly about these issues.
I like the idea of national proportional voting for the House of Representatives, state legislatures selecting senators, and district centered voting for local and state elections. I believe that our Congress should have a national perspective that is balanced by a State needs oreiented Senate and direct accountability for local and state lawmakers.
It would probably do wonders for the pork based spending. Plus, it would give the “fringe parties” a voice in the national government; at least in the House of Representatives.