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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.
Quick Answer. Barack Obama is famous for becoming the first African-American president of the United States. Obama is the 44th president of the United States, and his presidency is recognized for health care reform and economic stimulus legislation.