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He served one term in the US Senate before running for president and winning in 2008. Barack Obama before becoming president served in the US senate for less than 2 years and in the Illinois legislature. In both positions he was the most liberal person in the legislative body.
From 1992 until his election to the U.S. Senate in 2004, Barack Obama served as a professor in the Law School. He was a Lecturer from 1992 to 1996. He was a Senior Lecturer from 1996 to 2004, during which time he taught three courses per year.