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Mr Muller said he was confident his party would win
the newly formed Taieri electorate, which takes in the former Dunedin South electorate.
"The feeling on the ground is fantastic."
"We’ve got a superb candidate in Liam Kernaghan. He’s from this area, and I think that’s important."
Labour’s Taieri candidate, Ingrid Leary, moved to Dunedin late last year.
Dunedin South has been a Labour stronghold.
Clare Curran, who is standing down at this year’s election, has held the seat since 2008.
Mr Muller would not be drawn into the toilet seat debate surrounding National's Michael Woodhouse.
It was revealed this week Ms Curran had been sent photos in 2012 from a National Party's mainland regional conference, including one showing fellow Dunedin MP, Mr Woodhouse, and a blue toilet seat with her face emblazoned on it, a photograph Ms Curran said traumatised her.
"My focus is on pulling together an economic recovery plan for this country and so is New Zealand’s focus," Mr Muller said.
Mr Muller addressed those issues at a business breakfast, hosted by the Otago Chamber of Commerce at the Dunedin Club, and then toured ADInstruments’ headquarters in Vogel St before fronting media on a range of issues including the Government’s border control measures.