proponent

advocate advocator exponent

individual mortal person somebody someone soul

admirer apologist booster champion constitutionalist Darwinian democrat drumbeater federalist friend Gnostic humanist humanitarian ideologist ideologue internationalist interpreter irredentist irridentist isolationist Jansenist justifier libertarian Maoist Marxist nationalist neoclassicist neutralist nullifier partisan partitionist Platonist populist presenter pro-lifer protagonist protectionist representative republican ritualist ruralist secessionist secularist separationist separatist spokesperson sponsor suffragist supporter supremacist teleologist Thatcherite unilateralist vindicator voice zealot