Question: For which foundation is the 47th U.S. Vice President's chief of staff a former president?

full_context: Document 1: 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 2: United States Senate election in Delaware, 2002: The 2002 United States Senate election in Delaware was held on November 5, 2002. Incumbent Democratic U.S. Senator Joe Biden won re-election to a sixth term.
Document 3: Electoral history of Joe Biden: Electoral history of Joe Biden, 47th Vice President of the United States (2009–2017), United States Senator from Delaware (1973–2009). To date Joe Biden has not lost an election.
Document 4: Political positions of Joe Biden: Joe Biden served as the Vice President of the United States from 2009 to 2017. He served in the Senate from 1973 until 2009 and made his second run for President of the United States in the 2008 presidential election as a Democrat. Biden was announced as Democratic presidential nominee Barack Obama's running mate on August 23, 2008, and was elected Vice President on November 4, 2008.
Document 5: Delaware Community Foundation: The Delaware Community Foundation (DCF), one of more than 750 community foundations in the United States, is a nonprofit organization that establishes and manages charitable funds for individuals and organizations primarily from the state of Delaware and surrounding areas. Fundholders include individuals, families, businesses and organizations. The DCF awards annual grants of approximately $15 million and manages over $230 million in assets. The organization's 25th anniversary celebration in 2011 was attended by Vice President Joe Biden, who served as one of Delaware's U.S. Senators for 36 years.[http://www.whitehouse.gov/administration/vice-president-biden <nowiki>[5]</nowiki>]
Document 6: Bruce Reed (political operative): Bruce Reed (born March 16, 1960) is the former president of the Broad Foundation. Prior to assuming that role in December 2013, he served as Chief of Staff to U.S. Vice President Joe Biden and is a former CEO of the Democratic Leadership Council (DLC).
Document 7: Alec Reed: Sir Alec Edward Reed, CBE, FCMA, FCIPD (born 16 February 1934) is the founder of Reed Executive Ltd, one of the UK's largest private businesses. Knighted for services to business and charity in 2011, Reed is a high-profile charity donor and organiser. His various charitable initiatives have given away over £60m, mostly in support of women, addiction, overseas development, education and the arts. Reed has founded seven charities, several companies, two schools and is the author of four business books. His current job title at Reed is founder at large.
Document 8: Dick Cheney: Richard Bruce Cheney ( ; born January 30, 1941) is an American politician and businessman who was the 46th Vice President of the United States from 2001 to 2009.
Document 9: Beau Biden: Joseph Robinette "Beau" Biden III (February 3, 1969 – May 30, 2015) was an American attorney, officer in the Army Judge Advocate General's Corps, and politician from Wilmington, Delaware. He was the eldest of three children from the marriage of former U.S. Vice President Joe Biden and his first wife, Neilia Biden. He served as the Attorney General of Delaware, a major in the Delaware Army National Guard, and a member of the Democratic Party.
Document 10: Joe Biden presidential campaign, 1988: The 1988 presidential campaign of Joe Biden, the longtime Democratic United States Senator from Delaware and eventual 47th Vice President of the United States began on June 1987. He ran for President of the United States in the 1988 United States presidential election. He was considered one of the potentially strongest candidates in the field. However, in September 1987, newspaper stories stated he had plagiarized a speech by British politician Neil Kinnock. Other allegations of past law school plagiarism and exaggerating his academic record soon followed. Biden withdrew from the race later that month.
Document 11: United States Senate election in Delaware, 1972: The United States Senate election in Delaware, 1972 was held November 7, 1972. Incumbent Republican United States Senator J. Caleb Boggs ran for a third term in the United States Senate. Boggs faced off against Joe Biden, a New Castle County Councilman. Though Senator Boggs was expected to easily win a third term over the then-unknown Biden, it ended up being the closest Senate election in 1972, and Biden narrowly beat out Boggs by a little over three thousand votes, winning what would be his first of seven terms.
Document 12: Maureen Reed: Maureen Reed (born April 10, 1953) is a physician who was the chair of the Board of Regents of the University of Minnesota, Director of the Parks and Trails Council of Minnesota, and Medical Director and Vice-President of the not-for-profit health care provider HealthPartners. She initially announced that she would run as a Democrat in the sixth congressional district of Minnesota, USA in 2010, but withdrew.
Document 13: Joe Biden: Joseph Robinette "Joe" Biden Jr. ( ; born November 20, 1942) is an American politician who was the 47th Vice President of the United States from 2009 to 2017. A member of the Democratic Party, he represented Delaware as a United States Senator from 1973 until becoming Vice President in 2009.
Document 14: Hunter Biden: Robert Hunter Biden (born February 4, 1970) is the second son of former U.S. Vice President Joe Biden and his first wife, Neilia Biden. He is a partner at Rosemont Seneca Partners, LLC and is Counsel to Boies, Schiller, Flexner, LLP, a New York-based-law firm.
Document 15: Brad Woodhouse: Brad Woodhouse is the former president of the now-defunct liberal/progressive advocacy group Americans United for Change and the Democratic super PAC American Bridge 21st Century. He is the former communications director of the United States Democratic National Committee.
ground_truth: Broad Foundation