Which matters because it means that there's no connection between people's grumblings, discontents and fears, and whatever it is that insert-far-left-candidate-here happens to be spouting. The only real exception - George Galloway and Respect are something different - to that would be Tommy Sheridan before his own personal Fall, and I wonder how much of that was just personality cult politics (c.f. the occasional Midlands oddball - Dave Nellist, those weirdos in Walsall and the like - who can still sometimes win a seat on the local council) writ large.
Given all that Labour has done in government over the past 40 years, I think the weirdos of the left are those still inside Labour.