Kammala wannan jumla: Daga baya ya kasance yana da alaƙa da kamfanin buga mujallu a Pittsburgh da manyan jaridu a New Orleans, Louisiana. Ya shiga cikin jirgin ruwa a kan kogin Mississippi daga 1841 zuwa 1847 kuma a cikin zinare a California a 1851. Ya taimaka wajen gina Kamfanin Kamfanin Kamfanin na Cambria a Johnstown, Pennsylvania, a shekara ta 1853, kuma ya yi aiki da wannan kamfani har zuwa 1861, lokacin da ya yi murabus. Campbell ya kasance wakili ne na farko na Jam'iyyar Republican National Convention a Philadelphia a shekara ta
Shekara ta 1856.