Question: In the 2004 United States Senate election in Hawaii, which candidate won?

full_context: Document 1: Daniel Akaka: Daniel Kahikina Akaka ( ; born September 11, 1924) is an American educator and politician who was a United States Senator from Hawaii from 1990 to 2013. A member of the Democratic Party, Akaka was the first U.S. Senator of Native Hawaiian ancestry.
Document 2: Brian Schatz: Brian Emanuel Schatz (pronounced ; born October 20, 1972) is an American politician who is the senior United States Senator for Hawaii. Schatz was appointed by Governor Neil Abercrombie to replace Senator Daniel Inouye after his death in 2012.
Document 3: United States Senate election in Hawaii, 2004: The 2004 United States Senate election in Hawaii took place on November 2, 2004 alongside other elections to the United States Senate in other states as well as elections to the United States House of Representatives and various state and local elections. Incumbent Democrat U.S. Senator Daniel Inouye won re-election to an eighth term.
Document 4: Daniel Inouye: Daniel Ken "Dan" Inouye (Japanese: 井上 建 , Hepburn: Inoue Ken ) was a United States Senator from Hawaii from 1963 to 2012. He was a member of the Democratic Party, and he was President pro tempore of the United States Senate (third in line in the Presidential Line of Succession) from 2010 until his death in 2012, making him the highest-ranking Japanese American politician in U.S. history. Inouye also served as chairman of the U.S. Senate Committee on Appropriations.
Document 5: United States Senate election in New York, 2004: The 2004 United States Senate election in New York took place on November 2, 2004 along with elections to the United States Senate in other states as well as the presidential election, elections to the United States House of Representatives and various state and local elections. Incumbent Democratic U.S. Senator Chuck Schumer won re-election to a second term with 71.2% of the vote, a then-record margin of victory for any statewide candidate in New York's history. The record was surpassed by Kirsten Gillibrand when she won re-election to a first full term in 2012 with 72% of the vote.
Document 6: Oren E. Long: Oren Ethelbirt Long (March 4, 1889 – May 6, 1965), was the tenth Territorial Governor of Hawaii and served from 1951 to 1953. A member of the Democratic Party of Hawaii, Long was appointed to the office after the term of Ingram Stainback. After statehood was achieved he served in the United States Senate, one of the first two, along with Hiram Fong, to represent Hawaii in that body. Long was the only non-Asian American U.S. Senator from Hawaii until the appointment of Brian Schatz to the position in 2012.
Document 7: United States Senate election in Alabama, 2004: The 2004 United States Senate election in Alabama took place on November 2, 2004 alongside other elections to the United States Senate in other states as well as elections to the United States House of Representatives and various state and local elections. Incumbent Republican U.S. Senator Richard Shelby won re-election to a fourth term.
Document 8: United States Senate election in Iowa, 2004: The 2004 United States Senate election in Iowa was held on November 2, 2004. Incumbent Republican United States Senator Chuck Grassley ran for re-election to a fifth term in the United States Senate. Grassley and former State Senator Arthur A. Small won the Republican and Democratic primaries, respectively, unopposed, and faced each other in the general election. Though this election coincided with the highly competitive presidential election, Grassley was in little danger of losing his seat and defeated Small handily.
Document 9: United States Senate election in Wyoming, 2014: The 2014 United States Senate election in Wyoming took place on November 4, 2014 to elect a member of the United States Senate for the State of Wyoming. Incumbent Republican Senator Mike Enzi won re-election to a fourth term in office. Enzi held Democratic nominee Charlie Hardy to just 17.5 percent of the vote – the lowest percentage of the vote for any major party nominee in Wyoming U.S. Senate electoral history out of the 39 races conducted during the direct election era.
Document 10: David Ige: David Yutaka Ige ( ; born January 15, 1957) is an American politician who is the eighth and current Governor of Hawaii, in office since 2014. A Democrat, he previously served in the Hawaii State Senate, representing the 16th district, from 1995 to 2014. In the 2014 Hawaii gubernatorial election, he won the Democratic primary by defeating incumbent Governor Neil Abercrombie with 66% of the vote. Ige defeated Republican Duke Aiona and Independent Mufi Hannemann in the general election with 49.5% of the vote. He assumed office on December 1, 2014.
Document 11: United States Senate election in Hawaii, 1994: The 1994 United States Senate election in Hawaii took place on November 8, 1994. Incumbent Democratic U.S. Senator Daniel Akaka won re-election to his first full term.
Document 12: Patrick Leahy: Patrick Joseph Leahy (born March 31, 1940) is an American politician and the senior United States Senator from Vermont, since 1975. A member of the Democratic Party, Leahy served as the President pro tempore of the United States Senate from December 17, 2012, to January 6, 2015. As President pro tempore, he was third in the presidential line of succession. He is the most senior senator and took office at 34 years old, younger than any other current senator. Leahy received the title of President pro tempore emeritus upon the commencement of the 114th Congress. He is the last remaining member of the Senate to have served prior to the 1976 election of President Jimmy Carter.
Document 13: Robert Byrd: Robert Carlyle Byrd (born Cornelius Calvin Sale Jr.; November 20, 1917June 28, 2010) was a United States Senator from West Virginia. A member of the Democratic Party, Byrd served as a U.S. Representative from 1953 until 1959 and as a U.S. Senator from 1959 to 2010. He was the longest-serving Senator in United States history. In addition, he was, at the time of his death, the longest-serving member in the history of the United States Congress, a record later surpassed by Representative John Dingell of Michigan. Byrd was the last remaining member of the U.S. Senate to have served during the presidency of Dwight Eisenhower, and the last remaining member of Congress to have served during the presidency of Harry Truman. Byrd is also the only West Virginian to have served in both houses of the state legislature and both houses of Congress.
Document 14: United States Senate election in Alaska, 1984: The 1984 United States Senate election in Alaska was held on November 6, 1984. Incumbent Republican Senator Ted Stevens sought re-election to a third term in the United States Senate. Owing to his popularity and the conservative bent of Alaska, Stevens did not face major opposition, and easily crushed former Alaska Attorney General John Havelock in the general election.
Document 15: Mazie Hirono: Mazie Keiko Hirono ( ; Japanese name: 広野 慶子 "Hirono Keiko"; born November 3, 1947) is an American politician and the junior United States Senator from Hawaii, in office since 2013. Hirono, a member of the Democratic Party, previously served as a member of the Hawaii House of Representatives from 1985 to 1995 and as the Lieutenant Governor of Hawaii from 1994 to 2002, serving under Governor Ben Cayetano. She was the Democratic nominee for Governor of Hawaii in 2002 but was defeated by Republican Linda Lingle. She then served as a member of the United States House of Representatives for Hawaii's 2nd congressional district from 2007 to 2013.
ground_truth: Daniel Ken "Dan" Inouye