 Guerrero was elected to the Northern Mariana Islands House of Representatives, where he served from 1984 to 1985 during the 4th Commonwealth Legislature.During his time in the House, Guerrero served as the chairman on the CNMI House Committee on Appropriations.He was later elected to the Northern Mariana Islands Senate from 1986 to 1990 during the 5th and 6th Commonwealth Legislatures.