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

Context paragraphs:
United States Senate election in Indiana, 2010: The 2010 United States Senate election in Indiana took place on November 2, 2010, alongside 33 other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections to fill Indiana's class III United States Senate seat.  Incumbent Democratic U.S. Senator Evan Bayh decided in February 2010 to retire instead of seeking a third term shortly after former U.S. Senator Dan Coats announced his candidacy for Bayh's contested seat.  No Democratic candidate submitted enough signatures by the deadline to run, leading Democratic officials to choose U.S. Congressman Brad Ellsworth to be the nominee.  The Libertarian Party nominated YMCA instructor Rebecca Sink-Burris, who had previously run against Evan Bayh in the United States Senate election in Indiana, 1998 but with less success than in this election.  Republican nominee and former U.S. Senator Dan Coats won the open seat.

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.

United States Senate election in Alaska, 2004: The 2004 United States Senate election in Alaska 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, various state and local elections, and the presidential election of that year.  Incumbent Republican U.S. Senator Lisa Murkowski of Anchorage, sought election to her first full term after being appointed to serve out the rest of her father's unexpired term when he resigned in December 2002 to become Governor of Alaska.  Her main challenger was Democratic former Governor Tony Knowles, her father's predecessor as governor.  Murkowski won by a slight margin.

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.

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.

United States Senate election in California, 2004: The 2004 United States Senate election in California 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 Democratic U.S. Senator Barbara Boxer ran for re-election and defeated Republican former Secretary of State Bill Jones.  Boxer's 6.96 million votes set the all-time record for the most votes cast for one candidate in one state in one election, although it was surpassed by Senator Dianne Feinstein's 7.75 million votes in 2012.

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.

United States Senate election in Florida, 2004: The 2004 United States Senate election in Florida 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 Democratic U.S. Senator Bob Graham decided to retire instead of seeking a fourth term.  The primary elections were held on August 31, 2004.  Republican Mel Martínez won the open seat.

Alabama elections, 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, various state and local elections, and the presidential election of that year.

United States Senate election in Georgia, 2004: The 2004 United States Senate election in Georgia 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 Democratic U.S. Senator Zell Miller decided to retire, leaving an open seat.  Majette became both the first African American and the first woman to be nominated for the U.S. Senate in Georgia.  Republican Johnny Isakson won the open seat.

Supporting paragraphs: United States Senate election in Hawaii, 2004 Daniel Inouye
Answer: Daniel Ken "Dan" Inouye