After May, all polls should be treated with scepticism, but this survey mirrors the high number of constituency parties nominating Mr Corbyn.
A serial rebel, Mr Corbyn originally struggled to gain the 35 MPs’ nominations necessary to enter the leadership contest. Long preferring the purity of ideological opposition to the compromises of power, he began as the 100-1 outsider but his odds have since been slashed to 2-1, after he won the support of powerful unions. That he is leading the contest reiterates just how traumatised and angry many Labour members are following their defeat in May. In many ways, Mr Corbyn is an unreformed Bennite. The next month could decide the future of Labour as a viable, election-winning party.