This paper aims to clarify the spatial organization of supporter's association and an election strategy of Diet Members in Japan. A member of the Toyama Prefecture Third Constituency of the House of Representatives is chosen as a case study.
The findings can be summarized as follows: Supporter organizations of the selected Diet member consists of 20 political organizations that is organized by occupation, 7 local companies recognized as occupational branches of the Liberal Democratic Party (LDP) and 44 supporter's associations organized by the selected Diet member. Though all of these organizations support the studied member in the related constituency and its neighborhood, the electoral focus of the organizations is on Takaoka City, rather than other related voting areas. Moreover, offices and secretaries of the studied member are located in Takaoka City.
Particularly, the arrangement and spatial formation of supporter's associations differs by geographic area within Toyama Third Constituency. The selected Diet member organized 26 out of the total 44 supporter's associations in Takaoka City and formed each spatial organization of supporter's associations by elementary school districts regardless of its area and population. This is because the share of the votes for the studied member is comparatively low in Takaoka City due to more floating voters from the rival LDP members in this city. Thus, with the formation of spatial organization of supporter's associations by elementary school districts, the selected Diet member provides assistance and maintains good relationship with its supporter's associations. In exchange, the Diet member receives strong support from its supporter's associations.
Meanwhile, the remaining 18 supporter's associations are located outside of Takaoka City. Each supporter's association is spatially organized in each local municipality regardless of its area and population. In rural areas, the agricultural co-operatives and the members of local assemblies play important roles in the canvassing of votes for the selected Diet member. The local municipalities are spatial units managed by the agricultural co-operatives and elected members of local assemblies. Moreover, public enterprises are carried out by the local municipalities which have effects on the electorate.
The research concludes that the elementary school district and local municipality are the most important spatial organization of supporter's associations that effectively garner votes for the selected Diet member.
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