In this interview, Neil Kinnock gives an interesting commentary on Corbyn's parliamentary record and suitability for high office
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Tony Benn was vastly more capable in every possible way, from intelligence to charm, than Jeremy Corbyn. Not Corbyn's fault, it's just how it is.
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Jeremy, whatever his qualities, when people asked me about him, I said "look, I don't know anything about Jeremy Corbyn, because he never figured. He was such a guaranteed oppositionist that we never made any calculation that included him, or half a dozen others in the Parliamentary Labour Party. He was sitting there as the Member of Parliament for Islington - my Member of Parliament as it happens now, by some irony of fate - but this guy, by the time he became leader of the party, had been 33 years, a third of a century, In Parliament. There is no Jeremy Corbyn Private Members bill. There is no memorable question or speech in a debate. There is no evidence of presence on a Select Committee or a Standing Committee. All Jeremy did for 33 years - doubtlessly serve his constituency, fine, great - [was to] go around groups of people who already agreed with him."