They give the job to an 'electoral commission' so it doesn't look like too much of a fix. And remember, in our system they are 'representatives' not delegates, the assumption is we trust them to guess what we want. Getting 35% of the votes cast in a constituency gives them this right. Apparently. We have no way to recall or get rid of them unless they break the law or go mad. UKIP actually wanted to intorduce a recall system.
They manage pretty stable and sensible government in other places with it. It makes politicians talk to each other and compromise, actually stops the ideological extremes. But perhaps we aren't the right kind of people for it. Matt put his finger on it earlier, there is something wrong about voting for a national government and a local representative with one X. I voted Labour, because Swords told me too (and it didn't hurt that much) but I really detested their local candidate. Tricky.
It seems that we have a very flawed system then.

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