noun
support base; power base
Political term referring to the foundation of support, especially in an electorate or organization.
その政治家は地方の支持基盤を固めるために頻繁に地元に戻った。
The politician frequently returned to his hometown to solidify his local support base.
党の支持基盤が弱まっている。
The party's support base is weakening.
Compound of 支持 (support) and 基盤 (base, foundation).