;Labour Lee Martin, a farmer from Matangi, was selected by the Labour Party to contest the seat. He was president of the Waikato Farmers' Union and had contested the Hamilton electorate in 1925, where he placed second out of three candidates. Labour's candidate at the previous two elections—Ernest Piggott—announced his candidacy as an independent Labour candidate after losing the nomination to Martin. He later withdrew his candidacy. Following their stunning win at the Eden by-election the previous year, Labour were confident of winning. ;Liberal Samuel Charles Gale Lye, who contested Raglan for the Liberals in 1922 and 1925, declined to be a candidate again citing pressures of personal affairs. Thomas Parker was chosen for the by-election. Parker, a local sheep and dairy farmer and director of the Raglan Co-operative Dairy Company, had been chairman of the Raglan Town Board since 1917 and was also a member of the Raglan County Council. He professed to have received requests from all parts of the electorate that he stand as a candidate. Parker was endorsed by former Prime Minister Sir Joseph Ward who campaigned in the electorate for him. ;Reform The Reform Party had yet to streamline its candidate selection process which had caused it to lose the recent Eden by-election when official and "independent" Reformers competed against each other. Seven nominees came forward seeking the Reform nomination; E Allen, S. S. Allen, Campbell Johnstone, W. Seavill, S. G. R. Taylor, Harry Waring, Mervyn Wells. After addresses by each of the candidates three ballots were taken, the final of which gave a clear majority to Waring. Waring was a former farmer from Taupiri who later established a butchery. He had been chairman of Bollard's campaign committee at previous elections. He had previously ben president of the Waikato A. and P. Association and also president of the Raglan branch of the Reform Party. ;Others William James Taylor, who had previously been associated with the Reform Party announced his intention to contest the by-election as an independent candidate. He had been the chairman of the Tuakau Town Board since 1920.
Campaign
The by-election was a disaster for the Reform Government of New Zealand. The rural seat was previously safe for Reform, but the party selected an inexperienced non-entity who was opposed by an "independent Reform" candidate and a Liberal Party candidate; splitting the conservative vote. The Huntly coal-miners gave Labour's Martin a solid, dependable lack-lustre farmer their overwhelming support. Prime Minister Gordon Coates who had criss-crossed the electorate with three other ministers was humiliated; though Coates himself had drawn good crowds.
Results
The following table gives the election results: The election was won by Lee Martin with a majority of just 175, he carried only nine of the fifty booths. Martin won huge majorities among the coal mining areas in the Huntly district which carried the day for him. Labour's deputy leaderMichael Joseph Savage had campaigned for Martin in Waiuku and Te Uku where Labour's vote increased from 31 to 80 and 2 to 38 respectively. The election was proclaimed a success for Labour's new farming policy and Martin became the first farmer elected to Parliament as a Labour candidate. Reform sympathetic newspapers such as The New Zealand Herald and The Press were critical of the vote splitting that was continuing to allow Labour to win seats with small majorities and on minority votes. The more impartial Auckland Star noted the impressive recuperation of votes by the Liberal Party.
Aftermath
Martin held Raglan until 1931, when he was defeated by Stewart Reid but won the seat back in 1935. He remained MP for Raglan until 1943 when he retired. Waring's great-granddaughter Marilyn Waring was later elected MP for Raglan in 1975.
