Question: Which state did Joe Biden represent in the Senate for 36 years before becoming Vice President in 2009?

Documents:
source: Joe Biden
text: 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.

source: United States Senate election in Delaware, 2002
text: 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.

source: Mike Donilon
text: 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.

source: Beau Biden
text: 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.

source: Electoral history of Joe Biden
text: 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.

source: Political positions of Joe Biden
text: 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.

source: Delaware Community Foundation
text: 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>]

source: Hunter Biden
text: 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.

source: Cynthia Hogan
text: Cynthia Hogan Cynthia C. Hogan (born Cincinnati, Ohio about 1958) is the Vice President for Public Policy and Government Affairs at Apple. Previously Hogan served as Senior Vice President of Public Policy and Government Affairs for the National Football League, and prior to that as the Counsel to the Vice President of the United States, Joe Biden, under President Barack Obama. Hogan previously worked as Chief Counsel to Vice President Biden during his time in the United States Senate and served as Staff Director of the Senate Judiciary Committee.

source: United States presidential election, 2008
text: United States presidential election, 2008 The United States presidential election of 2008 was the 56th quadrennial presidential election. It was held on Tuesday, November 4, 2008. Democratic Party nominees Barack Obama, a U.S. Senator from Illinois, and his running mate Joe Biden, a long-time U.S. Senator from Delaware, defeated Republican Party nominees John McCain, a long-time and current U.S. Senator from Arizona, and his running mate Sarah Palin, a Governor of Alaska. Obama became the first African American ever to be elected president of the United States, and Joe Biden became the first Roman Catholic ever elected vice president.

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Answer: Delaware