Sillers ran in 1962 for the Minnesota House of Representatives for District 56. He was elected and then re-elected four times. He served District 56 followed by District 56A through 1972. He started his career in the House as an independent, but later joined the Independent-Republican party. In 1972 he was elected to the Minnesota Senate, representing the 9th district. He was re-elected to the Senate in 1976, but lost his 1980 re-election bid.
