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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.
Barack Obama did not teach at Harvard; he was a teaching assistant, which means he was helping a professor while studying for his degree (the professor he helped was a scholarâ¦ named Professor Laurence Tribe).