Question: The seventh season of American Idol, the annual reality show and singing competition, began on January 15, 2008, David Cook was announced the winner of the competition on May 21, 2008, defeating who, which American singer-songwriter, musician, and actor, as runner-up?

full_context: Document 1: Tiffany Evans discography: American singer and songwriter Tiffany Evans has released one studio album, two extended plays/mixtapes, nine singles, two featured singles and five promotional singles. Evans appeared on "Star Search" in February 2003, where she won the Grand Champion title in junior singer division. She competed against fellow singers Lisa Tucker and David Archuleta, who both later appeared on "American Idol". In the same year she signed to Columbia Records.
Document 2: The Declaration Tour – 2009: Declaration Tour is the first solo headline tour of the American rock singer-songwriter David Cook, who rose to fame after winning the seventh season of the reality television show "American Idol". There were 152 shows in this tour, not including an extra show in Manila in the Philippines, a record for an Idol debut tour. The tour earned an average gross of $46,263 per show.
Document 3: David Cook discography: This is a list of all albums and singles released by "American Idol" seventh season winner David Cook. Prior to appearing on "American Idol", in 2006, Cook self-released an album, "Analog Heart", during Cook's run on "Idol" until it was removed from sale. As of 2009, the album has sold fewer than 5,000 units in the United States.
Document 4: RuPaul's Drag Race (season 7): The seventh season of RuPaul's Drag Race began airing on March 2, 2015. Returning judges include RuPaul and Michelle Visage, while the space previously occupied by Santino Rice has been filled by new additions Ross Mathews and Carson Kressley. Matthews and Kressley are only both present for the season premiere and will take turns sharing judging responsibilities. Shawn Morales, a member of the Pit Crew since the third season and Simon Sherry-Wood, a member in the sixth season, do not appear this season and were replaced by Bryce Eilenberg. Like the previous two seasons of "RuPaul's Drag Race", the season featured 14 contestants competing for the title of "America's Next Drag Superstar", a one-year supply of Anastasia Beverly Hills cosmetics and a cash prize of 100,000 dollars. The premiere of season, the show debuted with a live and same-day viewership of 350,000, a 20% increase from the previous season. On March 20, 2015, it was announced that LogoTV had given the series an early renewal for an eighth season.
Document 5: David Archuleta: David James Archuleta (born December 28, 1990) is an American singer-songwriter, musician, and actor. At ten years old, he won the children's division of the Utah Talent Competition leading to other television singing appearances. When he was twelve years old, Archuleta became the Junior Vocal Champion on "Star Search 2". In 2007, at sixteen years old, he became one of the youngest contestants on the seventh season of "American Idol". In May 2008 he finished as the runner-up, receiving 44 percent of over 97 million votes.
Document 6: University of Utah Singers: The University of Utah Singers (UU Singers) was the premier choral ensemble at the University of Utah until 2010. The ensemble was organized in 2003 by Dr. Brady R. Allred. Composed of approximately 45 voices, the ensemble performed repertoire from a wide range of musical styles and eras. In their short history, UU Singers achieved both national and international acclaim, winning the Grand Prize at the 2005 Florilège Vocal de Tours International Choir Competition in Tours, France, winning the European Grand Prix Choral Competition in Tolosa, Spain in 2006, winning first prize at the 11th International Chamber Choir Competition Marktoberdorf in 2009, participating in the 19th Festival “Choralies de Vaison-la-Romaine” in France and the 37th Abu Gosh international vocal music festival near Jerusalem. The UU Singers performed in concerts throughout England, France, Spain, the Netherlands, Italy, the Czech Republic, Hungary, Croatia, Slovenia, Austria, Germany and Israel on five international concert tours, and has appeared on French national television at the Nancy International Choir Festival.
Document 7: American Idol: American Idol is an American singing competition television series created by Simon Fuller, produced by FremantleMedia North America and 19 Entertainment, and distributed by FremantleMedia North America. It began airing on Fox on June 11, 2002, and ended its first-run on April 7, 2016. In 2018, the show will make its debut on ABC. It started off as an addition to the "Idols" format based on the British series "Pop Idol", and became one of the most successful shows in the history of American television. The concept of the series involves discovering recording stars from unsigned singing talents, with the winner determined by the viewers in America through telephones, Internet, and SMS text voting. Winners chosen by viewers in its fifteen seasons were Kelly Clarkson, Ruben Studdard, Fantasia, Carrie Underwood, Taylor Hicks, Jordin Sparks, David Cook, Kris Allen, Lee DeWyze, Scotty McCreery, Phillip Phillips, Candice Glover, Caleb Johnson, Nick Fradiani, and Trent Harmon.
Document 8: David Cook (singer): David Roland Cook (born December 20, 1982) is an American rock singer-songwriter, who rose to fame after winning the seventh season of "American Idol" in 2008. Prior to "Idol" he released an independent album entitled "Analog Heart". This was followed by his post-"Idol" major-label debut "David Cook" which was released on November 18, 2008 and has since been certified platinum by the RIAA. His second major album "This Loud Morning" was released on June 28, 2011. His third post American Idol and fourth overall studio album "Digital Vein" was released on September 18, 2015.
Document 9: Michael Johns (singer): Michael Johns (born Michael John Lee; 20 October 1978 – 1 August 2014) was an Australian singer who finished in eighth place on the seventh season of "American Idol", in 2008. In 2009, he released a music album, "Hold Back My Heart," which sold 20,000 copies. Johns died on 1 August 2014, at the age of 35 of dilated cardiomyopathy.
Document 10: David Cook (album): David Cook is the first major-label studio album from seventh season "American Idol" winner David Cook. The album was released on November 18, 2008, in the United States by RCA Records. It was certified platinum and has sold over one million copies in the United States. It has produced two top twenty singles, "Light On" and "Come Back To Me". The single "The Time of My Life" has also been certified platinum by the RIAA. "Light On" was certified platinum in January 2010.
Document 11: Justin Guarini: Justin Guarini (born Justin Eldrin Bell; October 28, 1978) is an American singer/musician, actor, host and producer, who in 2002 was the runner-up on the first season of "American Idol."
Document 12: Deutschland sucht den Superstar (season 9): Deutschland sucht den Superstar (season 9) was the ninth season of "Deutschland sucht den Superstar". Luca Hänni won season 9. Jury members Fernanda Brandao and Patrick Nuo left DSDS and were replaced by Bruce Darnell and Cascada's Natalie Horler. As the winner, Luca Hänni received a recording contract with Universal Music Group and €500,000. Participants must be between the ages of 16 and 30 and living in Germany, Austria and Switzerland. The auditions stage had 34 audition events in 33 cities across Germany, Austria or Switzerland. 35.401 participants auditioned for season 9. Marco Schreyl will not be returning to host season 10.
Document 13: American Idol (season 7): The seventh season of American Idol, the annual reality show and singing competition, began on January 15, 2008 and concluded on May 21, 2008. Ryan Seacrest continued to host the show with Simon Cowell, Paula Abdul, and Randy Jackson returning as judges. David Cook was announced the winner of the competition on May 21, 2008, defeating runner-up David Archuleta by a margin of roughly 12 million votes out of over 97 million, which was at that time the highest recorded vote total ever recorded in the show's history. The split was 56 % to 44 %.
Document 14: Deutschland sucht den Superstar (season 10): Deutschland sucht den Superstar (season 10) was the tenth season of Deutschland sucht den Superstar. The winner gets a recording contract with Universal Music Group and €500 000. There were new features in season 10. Participants had to be between 16 and 30 years old and could audition in 30 cities in Germany, Austria and Switzerland. Bill and Tom Kaulitz from Tokio Hotel and Mateo from Culcha Candela became judges. Bruce Darnell and Natalie Horler both left after the completion of season 9. There was a trip to Curaçao during the recall. This is the first season in which three women reached the final four and the second season with a female final 2. After nine years, the show produced a female winner, since Elli Erl in Season 2. Beatrice Egli won the show as the second female winner.
Document 15: 2008 Kids' Choice Awards: The 21st annual Nickelodeon Kids' Choice Awards were held at the Pauley Pavilion, Los Angeles, California on March 29, 2008. The show was the first live-action/animated Kids Choice Awards show. The event was hosted by Jack Black. Voting began March 3 on Nick.com and Nicktropolis. A "Bring on the Nominees" special hosted by Lil' JJ aired also. The Naked Brothers Band and Miley Cyrus were musical performances for the show. A sweepstakes was announced to promote the show. The number of votes cast broke the record previously set in 2007. 86,708,020 kids cast 88,254,272 votes (since kids were allowed to vote multiple times) between March 3–29 in 18 categories, to honor and vote for their favorites. Votes were cast via Nick.com, Nicktropolis, TurboNick, and for the first time via Nick's new mobile website (wap.nick.com). The award show attracted 7.7 million viewers.
ground_truth: David Archuleta