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?
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.
David Brumbaugh David Brumbaugh (December 2, 1960 – April 15, 2017) was an American businessman and Republican politician from Oklahoma. Brumbaugh was a Representative in the Oklahoma House of Representatives for District 76, located in Broken Arrow, Oklahoma, and Chairman for the Oklahoma Republican House Caucus which serves as the majority party in the Oklahoma House of Representatives.