Question: Richard Jason Satawk "R. J." Harris, is a United States Army National Guard warrant officer, politician, law student and former Air Traffic Controller, in 2010, he unsuccessfully challenged which incumbent Republican, for the Republican Party nomination in the primary election for Oklahoma's 4th congressional district?
Sentence (from "Tom Cole"): 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).
Relevant evidence: No