Is it wise to proclaim yourself the next Prime Minister in your biography?

Stuff reports:

Federated Farmers may be preparing for a change in government. With Labour Party leader David Cunliffe due at its annual conference, president Bruce Wills said he would go and find “the minister”. Mr Wills did, however, query Mr Cunliffe’s supplied biography, which referred to him as the “next prime minister“.

I’ve never heard of an opposition leader including that line in their supplied biography.

Sure at party conferences and the like, it is normal for the person introducing the leader to use a line like that. But a fairly significant difference between having someone else call you that, and referring to yourself as the next Prime Minister.