Ka kammala wannan magana: A shekara ta 1950, ya fara aiki a matsayin editan "Wyoming Labor Journal". Ya yi aiki a matsayin mai gabatar da kara ga Laramie County daga 1950 zuwa 1956. A shekara ta 1957, an zabe shi a matsayin shugaban Jam'iyyar Democrat na Wyoming. Daga baya a wannan shekarar Gwamna Milward Simpson ya gabatar da kudirin haƙƙin ɗan adam wanda Roncalio ya tsara bayan ya ga an cire ma'aurata baƙar fata daga gidan abinci. Ya kuma yi aiki a matsayin wakili ga Majalisar Dinkin Duniya.
1956, 1960, 1964, da kuma 1968 Democratic National Conventions. A shekara ta 1958, an yi hasashen cewa zai iya zama Babban Shari'a mai yiwuwa, amma a ranar 3 ga Disamba, 1958, ya bayyana cewa ba ya so a nada shi a ofishin.