Title: United States Senate career of Barack Obama
Content:  Although a newcomer to Washington, he recruited a team of established, high-level advisers devoted to broad themes that exceeded the usual requirements of an incoming first-term senator. Obama hired Pete Rouse, a 30-year veteran of national politics and former chief of staff to Senate Democratic Leader Tom Daschle, as his chief of staff, and economist Karen Kornbluh, former deputy chief of staff to Secretary of the Treasury Robert Rubin, as his policy director. His key foreign policy advisers have included former Clinton administration officials Anthony Lake and Susan Rice, as well as Samantha Power, author on human rights and genocide (who resigned March 7, 2008). Obama held assignments on 
Title: Barack Obama
Content:  injuries. Obama held assignments on the Senate Committees for Foreign Relations, Environment and Public Works and Veterans' Affairs through December 2006. In January 2007, he left the Environment and Public Works committee and took additional assignments with Health, Education, Labor and Pensions and Homeland Security and Governmental Affairs. He also became Chairman of the Senate's subcommittee on European Affairs. As a member of the Senate Foreign Relations Committee, Obama made official trips to Eastern Europe, the Middle East, Central Asia and Africa. He met with Mahmoud Abbas before Abbas became President of the Palestinian National Authority, and gave a speech at the University of Nairobi in which he condemned corruption within the Kenyan government. Obama resigned his Senate seat on November 16, 2008, to focus on his transition period for the presidency.
Title: Cabinet of Barack Obama
Content:  Orszag resigned, effective from July 30, 2010. On July 13, 2010, the White House announced that Jack Lew had been chosen to replace Orszag as Director of OMB, subject to Senate confirmation. During confirmation hearings in the Senate, in response to questioning by Senator Bernie Sanders (I-VT), Lew said that he did not believe deregulation was a "proximate cause" of the financial crisis of 2007–2008: Lew told the panel that "the problems in the financial industry preceded deregulation," and after discussing those issues, added that he didn't "personally know the extent to which deregulation drove it, but I don't believe that deregulation was the proximate cause." On November 18, 2010, Lew was confirmed by the Senate by unanimous consent. Jack Lew served from November 18, 2010 – January 27, 2012, when he resigned to become Obama's White House Chief of Staff. Following Lew's resignation, Jeffrey Zients served as Acting OMB Director until Sylvia Mathews Burwell's confirmation 15 months later.
Title: Barack Obama Sr.
Content:  In late 1964, Obama Sr. married Ruth Beatrice Baker, a Jewish-American woman he had met in Massachusetts. They had two sons together before separating in 1971 and divorcing in 1973. Obama first worked for an oil company, before beginning work as an economist with the Kenyan Ministry of Transport. He gained a promotion to senior economic analyst in the Ministry of Finance. He was among a cadre of young Kenyan men who had been educated in the West in a program supported by Tom Mboya. Obama Sr. had conflicts with Kenyan president Jomo Kenyatta, which adversely affected his career. He was fired and blacklisted in Kenya, finding it nearly impossible to get a job. Obama Sr. was involved in three serious car accidents during his final years; he died as a result of the last one in 1982.
Title: Family of Barack Obama
Content:  Madelyn Dunham (née Madelyn Lee Payne) was Obama's maternal grandmother who worked in banking and became vice president of a bank in Hawaii. Obama grew up with her and remembered that when he was a child, his grandmother "read me the opening lines of the Declaration of Independence and told me about the men and women who marched for equality because they believed those words put to paper two centuries ago should mean something."
Title: Barack Obama
Content:  reside in Washington, D.C. During Obama's terms as president, the United States' reputation abroad, as well as the American economy, significantly improved. Obama's presidency has generally been regarded favorably, and evaluations of his presidency among historians, political scientists, and the general public frequently place him among the upper tier of American presidents. Since leaving office, Obama has remained active in Democratic politics, including campaigning for candidates in the 2018 midterm elections, appearing at the 2020 Democratic National Convention and campaigning for Biden during the 2020 presidential election. Outside of politics, Obama has published three bestselling books: Dreams from My Father (1995), The Audacity of Hope (2006) and A Promised Land (2020).
Title: Dreams from My Father
Content:  the fifth grade until his graduation in 1979. Obama writes: "For my grandparents, my admission into Punahou Academy heralded the start of something grand, an elevation in the family status that they took great pains to let everyone know." There, he met Ray (Keith Kakugawa), who was two years older and also multi-racial. He introduced Obama to the African-American community. Upon graduating from high school, Obama moved to the contiguous United States for studies at Occidental College. He describes having lived a "party" lifestyle of drug and alcohol use. After two years at Occidental, Obama transferred to Columbia College at Columbia University, where he majored in Political Science. After graduation, Obama worked for a year in business. He moved 
Title: David J. Lane (ambassador)
Content:  In early 2011, Lane joined the Obama administration during a period of staff change, serving as Assistant to the President of the United States and Counselor to the Chief of Staff in the White House, once again working for William M. Daley.
Title: Presidency of Barack Obama
Content:  Following his inauguration, Obama and the Senate worked to confirm his nominees to the United States Cabinet. Three Cabinet-level officers did not require confirmation: Vice President Joe Biden, who Obama had chosen as his running mate at the 2008 Democratic National Convention, Chief of Staff Rahm Emanuel, and Defense Secretary Robert Gates, who Obama chose to retain from the previous administration. An early list of suggestions came from Michael Froman, then an executive at Citigroup. Obama described his Cabinet choices as a "team of rivals," and Obama chose several prominent public officials for Cabinet positions, including former Democratic primary rival Hillary Clinton as Secretary of State. Obama nominated several former Clinton administration officials to the Cabinet and to other positions. On April 28, 2009, the Senate confirmed former Kansas governor Kathleen Sebelius as Secretary of Health and Human Services, completing Obama's initial Cabinet. During Obama's presidency, four Republicans served in Obama's Cabinet: Ray LaHood as Secretary of Transportation, Robert McDonald as Secretary of Veterans Affairs, and Gates and Chuck Hagel as Secretaries of Defense.
Title: Ro Khanna
Content:  As a student at the University of Chicago, Khanna worked for William D. Burns walking precincts during Barack Obama's first campaign for the Illinois Senate in 1996. Khanna interned for Jack Quinn when Quinn served as the Chief of Staff for Vice President Al Gore. As a sophomore, he interned at former president Jimmy Carter's Carter Center. Khanna worked at O'Melveny & Myers as an attorney representing technology companies on intellectual property and trade secret issues from 2004 to 2009. In 2009, President Obama appointed Khanna deputy assistant secretary of the United States Department of Commerce. In that role, Khanna led international trade missions and worked to increase 

Question: what was obama's former occupation?
Answer: Illinois State Senator.