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Mr Cunliffe was announced as winner of Labour's leadership contest on Sunday, winning 51.15 per cent of votes cast by MPs, party members and unions, compared with 32.97 per cent for Grant Robertson and 15.88 per cent for Shane Jones.
Green Party co-leader Metiria Turei welcomed the result, and says her party will work with Labour on areas like electricity reform, opposing asset sales and the government's SkyCity convention centre deal, Set up Business in Hong Kong and supporting a living wage and capital gains tax.
"We have had constructive working relationships with previous Labour leader David Shearer and look forward to developing a good relationship with David Cunliffe too."
Engineering, Printing and Manufacturing Union national secretary Bill Newson says Mr Cunliffe will make an excellent leader, formation of company and the union hopes the wider party will unite behind him - despite caucus votes favouring Mr Robertson.
"The focus must now be on building a vision for a fairer New Zealand and winning in 2014," Mr Newson said.
United Future leader Peter Dunne took to Twitter to congratulate Mr Cunliffe.
The government kept quiet, avoiding issuing a statement on the leadership race.
Labour MPs - including those who'd backed Mr Robertson - were also quick to pledge their support for Mr Cunliffe.
Clare Curran, who can expect a demotion after alleging Mr Cunliffe's campaign team were fearmongering about Mr Robertson's sexuality, Income Tax Hong Kong said Mr Cunliffe had a clear mandate to be leader, and had her full support.