Question: American politician Joe Heck ran unsuccessfully against Democrat Catherine Cortez Masto, a woman who previously served as the 32nd Attorney General of where?

full_context: Document 1: Dean Heller: Dean Arthur Heller (born May 10, 1960) is the senior United States Senator from Nevada and a member of the Republican Party. He was elected in Nevada to that state's open U.S. Senate seat in 2012.
Document 2: John Ensign: John Eric Ensign (born March 25, 1958) is an American veterinarian and former politician based in Las Vegas, Nevada. He was a Congressman and United States Senator from Nevada, serving in the latter seat from January 2001 until May 2011. He resigned amid a Senate Ethics Committee investigation.
Document 3: Brad Wenstrup: Brad Robert Wenstrup (born June 17, 1958) is an American politician, Army Reserve officer, and Doctor of Podiatric Medicine, who has been the U.S. Representative for Ohio 's 2 congressional district since 2013. A Republican, he defeated U.S. Representative Jean Schmidt in the 2012 Republican primary election and Democrat William R. Smith in the 2012 general election. Wenstrup is a colonel in the U.S. Army Reserve and an Iraq War veteran. After the shooting of Congressman Steve Scalise on the morning of June 14, 2017, Wenstrup attended to the wounded congressman until he was transported to MedStar Washington Hospital Center.
Document 4: Joe Sestak: Joseph Ambrose "Joe" Sestak Jr. (born December 12, 1951) is an American politician and retired U.S. Navy officer. A member of the Democratic Party, he represented Pennsylvania 's 7 congressional district in the United States House of Representatives from 2007 to 2011 and was the Democratic nominee for the United States Senate in 2010, losing to Republican nominee Pat Toomey. A two-star admiral, he was the highest-ranking military official ever elected to the United States Congress at the time of his election.
Document 5: Kamala Harris: Kamala Devi Harris ( , ; born October 20, 1964) is an American attorney and politician. A member of the Democratic Party, she currently serves as the junior senator from California. She previously served as the 32nd Attorney General of California.
Document 6: Catherine Cortez Masto: Catherine Marie Cortez Masto (born March 29, 1964) is an American attorney and politician who is the junior United States Senator from Nevada. She is a member of the Democratic Party. She previously served as the 32nd Attorney General of Nevada from 2007 to 2015.
Document 7: Chris Koster: Chris Koster (born August 31, 1964) is an American lawyer who served as the 41st Attorney General of Missouri from 2009 to 2017. Before he was elected attorney general, he had served in the Missouri Senate since 2005 representing the 31st Senatorial District as a Republican until August 1, 2007, when he switched to the Democratic Party.
Document 8: Frankie Sue Del Papa: Frankie Sue Del Papa (born September 21, 1949) is an American attorney and politician in the U.S. state of Nevada; she is associated with the Democratic Party. Del Papa was the first woman elected as Secretary of State of Nevada (1986) and the first woman elected as Nevada Attorney General (1990, 1994, and 1998). In addition, Del Papa was the first woman elected student body president at the University of Nevada.
Document 9: Joe Heck: Joseph John “Joe” Heck (born October 30, 1961) is an American politician, physician, and U.S. Army Brigadier General who had served as the U.S. Representative for Nevada's 3rd congressional district from 2011 to 2017. Heck, a member of the Republican Party, is a board-certified physician and served as a Nevada State Senator from 2004-08. He ran unsuccessfully against Democrat Catherine Cortez Masto in the general election for the open Nevada United States Senate seat in 2016. In the same year, Heck made headlines by joining a long list of Republicans who opposed the GOP nominee for President, Donald Trump.
Document 10: List of United States Senators from Nevada: Nevada was admitted to the Union on October 31, 1864. Its current senators are Democrat Catherine Cortez Masto (Class 3) and Republican Dean Heller (Class 1).
Document 11: Claire McCaskill: Claire Conner McCaskill ( ; born July 24, 1953) is an American politician and member of the Democratic Party who serves as the senior United States Senator from Missouri. She is the first female U.S. Senator elected in Missouri in her own right.
Document 12: John Hoeven: John Henry Hoeven III (born March 13, 1957) is an American politician and the senior United States Senator from North Dakota, in office since 2011. A member of the North Dakota Republican Party, he previously served as the 31st Governor of North Dakota from December 2000 to December 2010. Hoeven was elected to the U.S. Senate in the November 2, 2010 general election. He replaced junior Senator Byron L. Dorgan, who chose not to seek re-election. Hoeven became the senior Senator in 2013 after Kent Conrad retired and was replaced by Heidi Heitkamp, who was once Hoeven's opponent for the Governor's office.
Document 13: Kirsten Gillibrand: Kirsten Elizabeth Gillibrand (née Rutnik; ; born December 9, 1966) is an American attorney and politician who since 2009, has served as the junior United States Senator from New York, alongside the Democratic Leader of the United States Senate, Chuck Schumer. Before the Senate, she served for two years (2007-09) in the United States House of Representatives, representing New York's 20th congressional district. She is a member of the Democratic Party.
Document 14: 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.
Document 15: Joseph Kenney: Joseph D. "Joe" Kenney (born July 12, 1960) is an American politician and member of the Republican Party who represents District 1 of the Executive Council of New Hampshire. He previously served as a member of the New Hampshire Senate, representing the 3rd District from 2003 to 2009, and as a member of the New Hampshire House of Representatives from 1995 until 2003.
ground_truth: Nevada