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The launch was held in the party headquarters in Macandrew Rd, in party stronghold South Dunedin on Saturday afternoon.
Finance Minister Grant Robertson (above) spoke along with both candidates, and Southern Labour chairwoman Ruth Chapman.
Mr Robertson said Ms Hobbs would bring a lifetime of knowledge about how to make the environment more sustainable, and how to ensure social justice would be driven through environmental issues.
Mr Robertson and both candidates also appealed for people attending to get actively involved with their campaigns and sign up to door-knock.