Question: What ethnic group does the incumbent who was challenged by R.J. Harris in the 2010 for the  Republican Party nomination  in the primary election for Oklahoma's 4th congressional district?

Context paragraphs:
Troy Stanley: Troy Dwayne Stanley (born February 26, 1964), is a retired United States Navy Chief Petty Officer and owner-operator of Wally Dogz, a hot dog stand located in downtown Jacksonville, Florida.  Stanley has officially declared his candidacy for the U.S. House of Representatives seat representing Florida's 4th congressional district.  Stanley, a Republican, intends to challenge incumbent Ander Crenshaw in the 2010 Republican Primary Election.  He is now qualified as an Independent for the general election.

Pennsylvania's 10th congressional district: Pennsylvania's 10th Congressional District is located in the central and northeast regions of the state.  The district was one of the 12 original districts created prior to the 4th Congress.  It is currently represented by Republican Tom Marino, who defeated Democratic incumbent Chris Carney during the 2010 U.S. House elections.  In 2006, the 10th district experienced one of the greatest party shifts among all House seats that switched party control: in 2004, Republican Don Sherwood won with an 86% margin of victory over his nearest opponent and two years later, Carney unseated Sherwood by a 53%–47% margin.  In 2008, Carney won reelection by 12 points but the district swung back in 2010, electing Tom Marino.  The district is mostly Republican in its political composition, an aspect of the district that is reflected especially well in presidential elections.  In 2004, President George W. Bush won 60 percent of the vote in the district and in 2008, Senator John McCain beat Senator Barack Obama here by a margin of 54 percent to 45 percent.  Nonetheless, Carney easily won reelection as a Democrat the same year McCain won the district.  However, in the 2010 midterm elections, Marino unseated Carney by a 55%–45% margin.  In 2016, local business man and former mayor of Lewisburg, Pennsylvania, Mike Molesevich challenged Marino for the seat, but he fell to the Republican in November by more than two to one.  Marino remains the congressman in the 10th district, but he has expressed interest in a 2018 gubernatorial run rather than standing for reelection.

R. J. Harris: Richard Jason Satawk "R. J." Harris (born November 16, 1972) is a United States Army National Guard warrant officer, politician, law student and former Air Traffic Controller.  He was a candidate for the Libertarian Party's 2012 nomination for President of the United States.  In 2010, he unsuccessfully challenged incumbent Tom Cole for the Republican Party nomination in the primary election for Oklahoma's 4th congressional district.  He ran as an independent candidate for the same congressional seat in 2012.

Tim Burns (businessman): Timothy Richard "Tim" Burns (born April 14, 1968) is a Pennsylvania businessman.  He ran as a Republican in the 2010 special election to represent Western Pennsylvania's 12th congressional district in the U.S. House of Representatives.  Burns won the party nomination but lost the November general election to Democratic incumbent Mark Critz.  From mid-October 2011 until ending his campaign in early February 2012, Burns was a candidate for the Republican nomination for United States Senate to challenge incumbent Senator Bob Casey, Jr. in the 2012 election.

Brian Moore (political activist): Brian Patrick Moore (born June 8, 1943) is an American politician and founder of antiwar organization Nature Coast Coalition for Peace & Justice.  He was the presidential nominee of the Socialist Party USA for the 2008 United States presidential election.  He waged several campaigns for mayor and city council in Washington, D.C. and twice ran for the United States House of Representatives from Florida's 5th congressional district, winning none.  He ran for the Democratic Party nomination for Governor of Florida in 2010, but lost in the primary election.

Rocco Clarizio: Rocco M. Clarizio (December 17, 1916 – August 24, 1990) was an American Republican Party politician from Newark, New Jersey.  He ran for the U.S. House of Representatives in 1964 and for the New Jersey State Senate in 1977, but lost both times in the Republican primary.  In 1964, Clarizio became a candidate for Congress in New Jersey’s 10th district, seeking to challenge Democratic incumbent Peter W. Rodino.  In a historic primary where he was the only white candidate, Clarizio finished third behind two Black Republicans, William L. Stubbs and Dr. Harold R. Scott.  Stubbs, who became the first Black to win a major party nomination for Congressman from New Jersey, won 5,148 (63%) to 2,217 (26%) for Scott, with Clarizio finishing third with 892 votes (11%).  In 1977, Clarizo sought the Republican nomination for State Senator in the 28th legislative district, where Democratic incumbent Martin L. Greenberg was seeking re-election to a second term.  The GOP primary included three candidates, each aligned with a different candidate for the Republican nomination for Governor: Rev. James A. Pindar ran on a line with Assembly Minority Leader Thomas Kean; Joan Lacey Mazauskas ran with State Sen. Raymond Bateman, and Clarizio was allied with former Senate Minority Leader C. Robert Sarcone.  Pindar defeated Mazauskas by just 207 votes, 1,482 (42.04%) to 1,275 (36.17%), while Clarizio ran a distant third with 768 votes (21.79%).

Rico Oller: Thomas "Rico" Oller (born July 16, 1958) is a Republican U.S. politician from California.  He served in the California State Assembly, representing the 4th District from 1996 to 2000, and the California State Senate, representing the 1st district from 2000 to 2004.  In 2004, Oller ran for Congress in California's 3rd congressional district, but narrowly lost the Republican primary to former California Attorney General Dan Lungren.  On January 10, 2008, Oller again ran for Congress, this time in California's 4th congressional district, for a seat being vacated by retiring Congressman John Doolittle.  He faced opposition from former Congressman Doug Ose.  On March 4, 2008, Oller dropped out of the race when California State Senator Tom McClintock (R-Thousand Oaks) announced that he was running for Doolittle's seat.  In a statement, Oller said his decision was "a bitter pill indeed for me to swallow."  But, he said he was endorsing McClintock to prevent the election of Ose, whom he labeled as "an unarguably liberal Republican."  Oller ran for the newly former 5th Assembly District in 2012 facing Madera County Supervisor Frank Bigelow in the November general election.  Oller lost to Bigelow by 5.7%.

Steve Stockman: Stephen Ernest "Steve" Stockman (born November 14, 1956) is an American politician and member of the Republican Party.  He served as the U.S. Representative for Texas's 9th congressional district from 1995 to 1997 and for Texas's 36th congressional district from 2013 to 2015.  Stockman ran in the 2014 election for the United States Senate but lost the Republican primary to incumbent Senator John Cornyn.

Tom Cole: Thomas Jeffery Cole (born April 28, 1949) is the U.S. Representative for Oklahoma 's 4 congressional district , serving since 2003.  He is a member of the Republican Party.  He is a Deputy Majority Whip.  The chairman of the National Republican Congressional Committee (NRCC) from 2006 to 2008, he was, during his tenure, the fourth-ranking Republican leader in the House.  As of 2015, Cole – a member of the Chickasaw Nation – is one of only two registered Native Americans in Congress (the other being fellow Oklahoman Markwayne Mullin).

Texas's 8th congressional district: Texas District 8 of the United States House of Representatives is a Congressional district that includes Montgomery County and Walker County.  It includes much of the northern outlying areas of metro Houston.  The current Representative from District 8 is Kevin Brady and has been since 1997.  For the 2014 election cycle Craig McMichael, a veteran of the Marine Corps, and network engineer had challenged and lost to incumbent Kevin Brady in the Republican Primary.  In the 2014 General Election, Brady faced off against the Libertarian Party candidate, Ken Petty of Spring, Texas, who won his nomination in the Libertarian District Convention.  No Democrat ran.  In the 2016 election, the 20-year incumbent was challenged by 3 challengers: Andre Dean, Craig McMichael, and Steve Toth.  As of August 2017, Brady is expected to face Democrat Steven David in the 2018 election as well as Independent candidate Todd Carlton.  David is the first Democrat to challenge Brady since the 2012 election.

Supporting paragraphs: R. J. Harris Tom Cole
Answer: Native Americans