Question: Cheryl D. Mills (born 1965) is an American lawyer and corporate executive, she has served as Senior Adviser and Counsel for Hillary Clinton's 2008 presidential campaign, and is considered a member of Hillary Clinton's group of core advisers, self-designated as "Hillaryland", the self-designated name of a group of core advisors to Hillary Clinton, when she was First Lady of the United States and again when, as United States Senator, she was one of the Democratic Party candidates for President, in which election event?

full_context: Document 1: Hillary Clinton presidential campaign, 2008: The 2008 presidential campaign of Hillary Rodham Clinton, then junior United States Senator from New York, was announced on her website on January 20, 2007. Hillary Clinton was previously the First Lady of the United States and First Lady of Arkansas prior to her election as U.S. Senator from New York. She is also the wife of former President Bill Clinton. Clinton was the source of much media speculation since having expressed interest in being a candidate in the 2008 presidential election since at least October 2002.
Document 2: United States Senate election in New York, 2000: The United States Senate election in New York in 2000 was held on November 7, 2000. Hillary Rodham Clinton, then First Lady of the United States and the first First Lady to run for political office, defeated Congressman Rick Lazio. The general election coincided with the U.S. presidential election.
Document 3: Huma Abedin: Huma Mahmood Abedin (born July 28, 1976) is an American political staffer who was vice chair of Hillary Clinton's 2016 campaign for President of the United States. Prior to that, Abedin was deputy chief of staff to Clinton, who was U.S. Secretary of State, from 2009 to 2013. She was also the traveling chief of staff and former assistant for Clinton during Clinton's campaign for the Democratic nomination in the 2008 presidential election.
Document 4: Clinton family: The Clinton family is a prominent American political family related to Bill Clinton, the 42nd President of the United States (1993–2001), and his wife Hillary Clinton, the 67th United States Secretary of State (2009–13), Senator from New York (2001–09) and the First Lady of the United States (1993–2001). Their immediate family was the First Family of the United States from 1993 to 2001. In 2016, Hillary Clinton became the first female presidential nominee from a major political party in United States history. The Clintons (Bill and Hillary) are the first married couple to each be nominated for president. She was defeated in the election by businessman Donald Trump.
Document 5: Mike Donilon: Mike Donilon, a lawyer and political campaign consultant, is a partner at AKPD Message and Media. Between 2009 and 2013, he served as Counselor to the Vice President under Vice President Joe Biden. Prior to his White House appointment, Donilon worked with the vice-presidential candidate to help him prepare for the debates and also as a traveling advisor. He has been an advisor and consultant to Vice President Biden since 1981.
Document 6: Susan Thomases: Susan P. Thomases (born 1944) is a New York-based attorney. She served as personal counsel and an informal adviser to Hillary Clinton during the presidency of Bill Clinton. She was a prominent witness during the Senate Whitewater Hearings in 1995. She served as the model for the character Lucille Kaufmann from the 1996 political novel "Primary Colors".
Document 7: Hillaryland: Hillaryland was the self-designated name of a group of core advisors to Hillary Clinton, when she was First Lady of the United States and again when, as United States Senator, she was one of the Democratic Party candidates for President in the 2008 U.S. election.
Document 8: Ann O'Leary: Ann M. O'Leary (born 1971 or 1972) is an American political advisor, lawyer, and nonprofit leader who specializes in early childhood education. She worked in the Bill Clinton administration and for Hillary Clinton during her time as First Lady, Senate career, and 2008 and 2016 presidential campaigns. She served in leadership positions at various nonprofit organizations that focus on early childhood education, including Next Generation and the Opportunity Institute. After Clinton's unsuccessful 2016 presidential campaign, O'Leary became a lawyer at the Palo Alto office of the law firm Boies, Schiller & Flexner.
Document 9: Sheila Nix: Sheila Nix is an American political strategist, most recently serving as Chief of Staff to Jill Biden, the wife of Vice President Joe Biden since April, 2013.
Document 10: Steven Reich: Steven F. Reich is an American attorney. Reich graduated from Columbia College in 1983. He began his career as an associate at the prominent Washington, D.C. law firm Covington & Burling following his graduation from Columbia Law School in 1986. From 1994-1998, Reich served as an Assistant Federal Public Defender for the District of Maryland. In 1998, he moved to the Minority staff of the Judiciary Committee of the U.S. House of Representatives, where he was Deputy Chief Investigative Counsel during the impeachment proceedings against President Bill Clinton. After President Clinton's impeachment by the House, Reich Served as impeachment counsel to the Minority Members of the U.S. Senate. He thereafter served as Senior Associate Counsel to President Clinton from 1999-2001.
Document 11: United States Senate career of Hillary Clinton: Hillary Rodham Clinton served as a United States Senator from New York from January 3, 2001 to January 21, 2009. She won the United States Senate election in New York, 2000 and the United States Senate election in New York, 2006. Clinton resigned from the Senate on January 21, 2009 to become United States Secretary of State for the Obama Administration.
Document 12: Gregory B. Craig: Gregory Bestor "Greg" Craig (born March 4, 1945) is an American lawyer and former White House Counsel under President Barack Obama from 2009 to 2010. A former attorney at the Washington, D.C. law firm of Williams & Connolly, Craig has represented numerous high-profile clients. Prior to becoming White House Counsel, Craig served as assistant to the President and special counsel in the White House of President Bill Clinton, where he directed the team defending Clinton against impeachment. Craig also served as a senior advisor to Senator Edward Kennedy and Secretary of State Madeleine Albright.
Document 13: Cheryl Mills: Cheryl D. Mills (born 1965) is an American lawyer and corporate executive. She first came into public prominence while serving as deputy White House Counsel for President Bill Clinton, whom she defended during his 1999 impeachment trial. She has worked for New York University as Senior Vice President, served as Senior Adviser and Counsel for Hillary Clinton's 2008 presidential campaign, and is considered a member of Hillary Clinton's group of core advisers, self-designated as "Hillaryland". She served as Counselor and Chief of Staff to Hillary Clinton during her whole tenure as United States Secretary of State. After leaving the State Department in January, 2013, she founded BlackIvy Group, which builds businesses in Africa.
Document 14: Hillary Doctrine: The "Hillary Doctrine" is a term used to describe the agenda of former United States Secretary of State Hillary Rodham Clinton. In particular, the Hillary Doctrine refers to talks given by Clinton arguing that women's rights and violence against women should be considered issues of national security. The doctrine encompasses stances she has held before, during, and after her tenure as secretary.
Document 15: Hillary Clinton: Hillary Diane Rodham Clinton ( ; born October 26, 1947) is an American politician who was the First Lady of the United States from 1993 to 2001, U.S. Senator from New York from 2001 to 2009, 67th United States Secretary of State from 2009 to 2013, and the Democratic Party's nominee for President of the United States in the 2016 election.
ground_truth: 2008 U.S. election