Listen HERE and start from 13:15. Keep listening until 16:45.
That doesn't sound to me like 'Tony Benn supports Ed Miliband', as reported by the New Statesman and blogged about in a number of places. A few clues:
"I have always supported John McDonnell."
"I think it's important that people should vote for those whose general approach they support, and the broader the range of discussion in the party the healthier the party will be."
"I support him (McDonnell) very strongly and the line he's taken on many issues."
George Eaton's little article at the Staggers certainly shows creativity of interpretation, but loses marks on the small matter of having any supporting evidence.