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The LibDems got totally stitched up by the Tories in that coalition, such was there desperation to be in power.
A change of voting system should have been their absolute minimum criteria. To agree to let it go to a referendum was naive and showed their inexperience, and, you could argue, was the event that gave Cameron the idea to offer one on EU membership as it was a non-event with very low turnout.
Re the coalition - that is exactly my point that it will take a long while for politicians to work out how to effectively work in coalitions. But even at the start, IMO it'll be better and fairer than what we have now.