Today marks the last day of campaigning ahead of tomorrow's voting with a final result expected around 10pm.
Polls last week showed Labour's David Shearer with a massive lead over his nearest opponent National's Melissa Lee with Green Party co-leader Russel Norman in third.
Labour fears apathy and bad weather could eat into their lead.
There are also concerns from Labour that their supporters could vote for the Greens.
Despite these fears it would take a huge turn around for Labour to lose the seat that was held by former prime minister Helen Clark for decades.
National went into the campaign with high hopes that the recent campaign victory, continuing nationwide popularity and the sometimes quirky nature of by-elections might give them a chance of an upset.
However, Ms Lee made a series of gaffes and ill-judged comments which virtually eliminated any chance she had of taking the seat.
The announcement of details of a motorway cutting through the electorate also may have damaged National's chances.
Yesterday Ms Lee managed to infuriate a low-income audience in the electorate by telling them she was paid only $2 an hour.
Appearing in a candidate's debate in front of members of the Unite union, Ms Lee was asked how she would survive on the minimum wage of $12.50 an hour.
"I think I am currently on $2 an hour," Ms Lee replied.
Ms Lee appeared to be joking about MPs' long hours, but it did not amuse the audience of low wage earners.
Ms Lee is paid $131,000 a year and is entitled to $14,860 in expense allowances, as well as $24,000 in accommodation benefits and free travel.
A worker on the minimum wage working 40 hours a week earns $26,000 a year and, if they have children, are entitled to Working for Families assistance.
By the time she got to explaining that she had also once struggled as solo mother with little money and a mother to support, any sympathy the audience may have felt was long gone.
Mr Shearer urged voters to get out and support Labour saying it was "about turning the corner" after last year's election defeat.
Dr Norman repeatedly asked those who were thinking about voting Labour to send a message to the larger party they were not happy with their performance when in government.
