Barack Hussein Obama II ( (listen); born August 4, 1961) is an American politician and attorney who served as the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, Barack Obama was the first African-American president of the United States. A member of the Democratic Party, Barack Obama was the first African-American president of the United States. He previously served as a U.S. senator from Illinois from 2005 to 2008 and an Illinois state senator from 1997 to 2004. Obama signed many landmark bills into law during his first two years in office. Obama signed many landmark bills into law during his first two years in office.