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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.
Obama has chosen John B. King Jr., who currently acts as deputy secretary of education, to replace Duncan. King is a Brooklyn native who often credits teachers with guiding him toward a successful path after he was orphaned at age 12.