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?

<P0-S0> 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. <P0-S1>  He was a candidate for the Libertarian Party's 2012 nomination for President of the United States. <P0-S2>  In 2010, he unsuccessfully challenged incumbent Tom Cole for the Republican Party nomination in the primary election for Oklahoma's 4th congressional district. <P0-S3>  He ran as an independent candidate for the same congressional seat in 2012. <SEP> <P1-S0> Thomas Jeffery Cole (born April 28, 1949) is the U.S. Representative for Oklahoma 's 4 congressional district , serving since 2003. <P1-S1>  He is a member of the Republican Party. <P1-S2>  He is a Deputy Majority Whip. <P1-S3>  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. <P1-S4>  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). <SEP> <P2-S0> Pennsylvania's 10th Congressional District is located in the central and northeast regions of the state. <P2-S1>  The district was one of the 12 original districts created prior to the 4th Congress. <P2-S2>  It is currently represented by Republican Tom Marino, who defeated Democratic incumbent Chris Carney during the 2010 U.S. House elections. <P2-S3>  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. <P2-S4>  In 2008, Carney won reelection by 12 points but the district swung back in 2010, electing Tom Marino. <P2-S5>  The district is mostly Republican in its political composition, an aspect of the district that is reflected especially well in presidential elections. <P2-S6>  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. <P2-S7>  Nonetheless, Carney easily won reelection as a Democrat the same year McCain won the district. <P2-S8>  However, in the 2010 midterm elections, Marino unseated Carney by a 55%–45% margin. <P2-S9>  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. <P2-S10>  Marino remains the congressman in the 10th district, but he has expressed interest in a 2018 gubernatorial run rather than standing for reelection. <SEP> <P3-S0> Texas District 8 of the United States House of Representatives is a Congressional district that includes Montgomery County and Walker County. <P3-S1>  It includes much of the northern outlying areas of metro Houston. <P3-S2>  The current Representative from District 8 is Kevin Brady and has been since 1997. <P3-S3>  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. <P3-S4>  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. <P3-S5>  No Democrat ran. <P3-S6>  In the 2016 election, the 20-year incumbent was challenged by 3 challengers: Andre Dean, Craig McMichael, and Steve Toth. <P3-S7>  As of August 2017, Brady is expected to face Democrat Steven David in the 2018 election as well as Independent candidate Todd Carlton. <P3-S8>  David is the first Democrat to challenge Brady since the 2012 election.