Corbyn isn't interested in the 'traditional Labour vote'.
He was carried to the leadership by a different support base - the other Labour tribe. Young, possibly middle class, possibly university educated, liberal and located in the city centres. It's that base that will be mobilised to re-elect him.
I'm a bit of a broken record on this, but with a tweak this is the heart of the Corbyn project. HIs support base in the party - party itself and 3 quidders -
is predominantly professional (and young) - along with a good few Labour lefties who drifted away from the party over the last 20 years.
His problem is he thinks that
is connecting with the working class. He's repeating the mistakes of the 80s Labour left, in thinking you don't need to go out into communities, engage with people, do some organising. This is partly a long standing problem of left labourism but its also about party structures. Its all 'come to us, join', not going out, mobilising, taking risks.
It was always going to be a big ask for the corbyn faction to do this, it breaks the habits of a lifetime. I was never part of it and thought it unlikely they would really engage. However I'm critical of them now for not doing it - because in a sense that was just about the only thing they
could do after the defeat of 2015*. For Labour to succeed they need to not so much recreate their relationship with the working class, but actually
have a relationship. The impasse corbyn is now trapped in is a long way from being his fault and I hope he wins. However it is still being played out as a internal party battle rather than a battle of social forces (for example, his best hope is now the '60,000' - people who have
joined the party and might ride to his rescue. Impressive numbers certainly - as much inspired by brexit as corbyn's plight I imagine - but it's still about people only getting a voice when they step inside).
* You could reasonably point to the attacks the blairites have made on him from day 1 with regard to why he hasn't really engaged. However, 10 months on there should really be some signs of it if he was ever going to move out beyond Westminster.