He said although he was aware he was on the turf of "the boy of the North" - Shane Jones - he was a friend of the North.
His pledge for government partnerships with regional communities, such as extending the rail link to NorthPort, also went down well.
Fellow candidate Grant Robertson said his priority was putting jobs at the centre of all Labour did - and he believed industries such as wood processing should be supported.
He also won loud applause when he mentioned the success in getting the asset sales referendum.
Mr Jones said that if he was Prime Minister he would ensure Auckland helped the regions.
He said he had been criticised by Northlanders for his opposition to the Puhoi "holiday highway". But he said the road would never reach Northland proper because it would end "where all the Aucklanders go, the flash baches in Leigh and Matakana".
The contenders have come under fire for committing to uncosted policies in the bid to secure the votes of party members and union delegates.
Yesterday Prime Minister John Key questioned the price tag of Mr Cunliffe and Mr Robertson's pledge to introduce a "living wage" of $18.40 an hour in the public sector, and for all government contractors.
Mr Cunliffe said the first step would cost $20-$30 million in its first year. But Mr Key said lifting the wage to the lower level of $15 an hour for workers in the ministries of health, social development, education and ACC alone would have totalled $68 million a year.
"So I'm pretty sceptical about the $20-$30 million.
"It sounds great in principle until you put 26,000 people on the dole queue and cost the economy somewhere round $2 billion."
Mr Cunliffe said his figure was only to introduce the living wage in the core public service in the first year.