As you may have noticed I don't think too highly of Ken Livingstone, I suspect the feeling is mutual. I have written on a number of occasions about his unsuitability to be mayor, a list of them can be found here.
But when a Conservative warns you about Livingstone it is easy for people to say "well he would say that wouldn't he!"
Well, don't take my word for it. You can read what other left wingers have said about Livingstone here, here and here. Not good news for the current Mayor of London.
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