Jones began his elected career in 1973, when he was elected to the Illinois House of Representatives. He served in that capacity from 1973 to 1983. During that time he served as the Chairman of the Insurance Committee and was an Assistant Democratic Leader. In 1982 he was elected to the Illinois Senate. In addition to being the president of the Senate, he also serves as a member of the Executive Committee. He lost Democratic primary bids for a congressional seat in 1988 and 1995.