Labour leader Andrew Little admits winning the Northland electorate will be an uphill battle - but believes the party could benefit from Northlanders' sense that National has taken their votes for granted.
Mr Little was in Kawakawa on Sunday for the launch of Labour candidate Willow-Jean Prime's campaign.
The by-election, triggered by National MP Mike Sabin's resignation, is on March 28 and will cost taxpayers up to $1 million.
Mr Little used his speech to praise Mrs Prime's passion and commitment to Northland, and quipped that National believed it could "pin a blue ribbon on a donkey" and still win the seat.
"We know it's going to be an uphill battle, but I detect a sentiment up here that people are being taken for granted and that National has mucked them around in terms of representation," he said.