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

Context articles: Kamala Harris
Maryland Attorney General election, 2014
Corey Palumbo
Catherine Cortez Masto
Joe Heck
List of United States Senators from Nevada
Dennis Heck
Samuel D. Jackson
George Henry Williams
Jeff Harris (politician)

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.
The Maryland Attorney General election of 2014 was held on November 4, 2014, to elect the Attorney General of Maryland.
 Incumbent Democratic Attorney General Doug Gansler was eligible to seek a third term in office, but instead ran unsuccessfully for the Democratic nomination for Governor of Maryland.
Corey Lee Palumbo (born August 16, 1972) is a West Virginia State Senator representing the 17th district in the West Virginia Senate.
 A state senator since 2009, he previously served as a member of the West Virginia House of Delegates from 2003 to 2009.
 He is the son of Mario Palumbo, the 32nd Attorney General of West Virginia as well as a former five-term state senator.
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.
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.
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).
Dennis Lynn "Denny" Heck (born July 29, 1952) is an American politician who has been the United States Representative for Washington's 10th congressional district since 2013.
 Heck was previously the Democratic nominee for U.S. Representative for the 3rd district in 2010, but was defeated by Jaime Herrera Beutler (R).
 In 2012 Heck ran and won in the newly created 10th district, defeating Republican Dick Muri.
Samuel Dillon Jackson (May 28, 1895March 8, 1951) was a United States Senator from Indiana.
 Born near Zanesville, Indiana, he attended the public schools of Fort Wayne and graduated from a predecessor of the now Indiana University Robert H. McKinney School of Law in Indianapolis in 1917, gaining admission to the bar the same year.
 During the First World War, he served as a captain of infantry from 1917 to 1919, and engaged in the practice of law at Fort Wayne in 1919.
 He was prosecuting attorney of Allen County from 1924 to 1928.
 He ran unsuccessfully as a Democrat for election in 1928 to the Seventy-first Congress, and was attorney general of Indiana from 1940 to 1941.
 On January 28, 1944, he was appointed as a Democrat to the U.S. Senate to fill the vacancy caused by the death of Frederick Van Nuys and served from January 28, 1944, to November 13, 1944, when a duly elected successor qualified.
 Jackson was not a candidate for election to fill the vacancy, and was an unsuccessful Democratic candidate for Governor of Indiana in 1944.
 He resumed the practice of law, and died in Fort Wayne in 1951; interment was in Lindenwood Cemetery.
George Henry Williams (March 26, 1823April 4, 1910) was an American judge and politician.
 He served as Chief Justice of the Oregon Supreme Court, was the 32nd Attorney General of the United States, and was elected Oregon's U.S. Senator, and served one term.
 Williams, as U.S. Senator, authored and supported legislation that allowed the U.S. military to be deployed in Reconstruction southern states to allow for an orderly process of readmittance into the United States.
 Williams was the first presidential Cabinet member to be appointed from the Pacific Coast.
 As attorney general under President Ulysses S. Grant, Williams continued the prosecutions that shut down the Ku Klux Klan.
 He had to contend with controversial election disputes in Reconstructed southern states.
 President Grant and Williams legally recognized P. B. S. Pinchback as the first African American state governor.
 Williams ruled that the "Virginius", a gun-running ship captured by Spain during the Virginius Affair, did not have the right to bear the U.S. flag.
 However, he argued that Spain did not have the right to execute American crew members.
 Nominated for Supreme Court Chief Justice by President Grant, Williams failed to be confirmed by the U.S. Senate primarily due to Williams' removal of A. C. Gibbs United States District Attorney at Portland, Oregon.
Jeff Harris (born October 7, 1964) is an attorney and a Missouri Democratic politician.
 He represented the 23rd District of Missouri in the Missouri House of Representatives from 2003–2009 and ran unsuccessfully for the office of attorney general in 2008.
 He served as Minority Floor Leader before giving up the post in order to focus more time on the attorney general race.