"She does that whole 'Westie chick' thing," Dr Duncan said. "She's lippy and street-smart."
Dr Duncan said that a possible defeat would do Mr Bridges little harm.
"My impression is that he's a tough dude and would take it on the chin," Dr Duncan said of Mr Bridges. "He would've had a crack and had some public exposure and gotten his colleagues thinking about him."
Auckland University professor Raymond Miller said Mr Bridges and Ms Bennett had much in common, including being Maori and being relatively young.
Mr Bridges was highly-regarded as a Cabinet minister and held rural appeal, but Ms Bennett's gender gave her an edge as it would be desirable to have a woman in a senior position.
Dr Miller agreed that Mr Bridges could gain from the experience even if he lost to Ms Bennett.
"He's not widely known around New Zealand and this is a way of getting his name out there and being seen as someone who might be a leader."
Otago University associate professor Janine Hayward agreed the candidates had little to lose. She felt that the race was close and would come down to who had forged the best relationships with their colleagues.
Any loss would "just show that they are ambitious and that the timing is not right".
Mr Bridges had earlier said he did not believe gender would be a factor, as "paint by numbers" diversity was undesirable.
He pledged to provide "change and rejuvenation" if he were to win the deputy's job.