Barack Obama served three terms in the Illinois Senate from 1997 to 2005, when he was elected to the United States Senate.During this part of his career, Obama continued teaching constitutional law part time at the University of Chicago Law School as he had done as a Lecturer from 1992 to 1996, and as a Senior Lecturer from 1996 to 2004.. In 1994, Senator Alice Palmer decided to run for the …

https://en.m.wikipedia.org/wiki/Illinois_Senate_career_of_Barack_Obama