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When elected politicians defect to other parties
why doesn't this automatically trigger a by-eleection?
I'm mainly talking about this http://news.bbc.co.uk/1/hi/wales/wales_politics/8401427.stm though I appreciate that not many people here are bothered by Welsh politics.
I also find it a bit bonkers that someone will one day wake up and decide to leave a left wing party for a right wing one, how can you have any credibility with your constituents?