Kammala wannan jumla: Cushing ya wakilci Massachusetts a cikin Na farko (a lokacin da ya sanya hannu kan Ƙungiyar Ƙasar) da kuma
Na biyu Continental Congress amma an zabe shi lokacin da ya yi adawa da 'yancin kai. Duk da wannan, ya ci gaba da kasancewa cikin siyasa bayan samun 'yanci, yana ci gaba da aiki a cikin gwamnatin jihar. A lokacin yakin neman 'yanci, ya kasance kwamishinan da ke da alhakin samar da sojoji, matsayin da ya yi amfani da shi don wadatar da kasuwancin dangi. An zabe shi mataimakin gwamnan jihar a shekarar 1780. A siyasance yana da alaƙa da ɗan'uwansa gwamna John Hancock, ya kasance mataimakin gwamna har zuwa mutuwarsa a 1788, a takaice yana aiki a matsayin mai kula da gwamna a 1785 tsakanin murabus na Hancock da zaɓen James Bowdoin.