Would a New Leader win back the base?

David Farrar says that Labour are screwed because they cant win their base in his stuff article.

But the real shocker comes among the “struggling” respondents. Normally Labour would have at least a 2:1 margin here. But the poll finds that the strugglers have 42 per cent support for National and 40 per cent for Labour.

Being unable to win a plurality of voters even among your own base is very rare. A party’s base voters are those who tend to stick with it through bad times as well as good times.

Have Labour being doing internal polls to show them if a new leader will win back their base? If so will Winston Peters release the details of these internal polls?