Since when has the incumbent challenged by R.J. Harris in 2010 served in Congress?
2003
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).
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.
Chikadibia Isaac Obiakor
Lieutenant General Chikadibia Obiakor (born 18 February 1951 in Nigeria) is a retired Officer of the Nigerian Army who until 2010 served as Military Adviser, Assistant Secretary General Office of Military Affairs, United Nations Department of Peace Keeping Operations (UNDPKO), UN Headquarters New York.
 .
 He retired officially from the Nigerian Army in 2011. Dagmar C. G. Lorenz
Dagmar C. G. Lorenz is Professor of German studies and from 2006 to 2010 served as Director of Jewish Studies at the University of Illinois at Chicago.
 She teaches and publishes on Austrian, German and German-Jewish literature and culture, and Holocaust Studies.
 She was born in Goslar, West Germany and began her studies (German, English, Philosophy, Pedagogy) at the University of Goettingen (Germany).
 She completed her Ph.D. in German (1973) and her MA in English (1974) at the University of Cincinnati.
 She taught at Rutgers University/Douglass College (1974/5), Ohio State University, Columbus (1975-1982 Assistant Professor; 1982-1988 Associate Professor; 1989-1998 Professor), University of Illinois at Chicago (1998-present; Interim Head, Germanic Studies 2002-2003), and held a Visiting Professorship at the University of Chicago (2000).
 She served as the editor of The German Quarterly (1997-2003) and held offices with MLA, GSA, MALCA, and AATG. Emmanuel Okyere
Brigadier-General Emmanuel Okyere is a Ghanaian military personnel and served in the Ghana Army.
 He rose through the ranks to become Brigadier-General in the Ghana Armed Forces.
 He is currently serving as National Security Adviser for the Fourth Republic of Ghana under the government of Nana Akufo-Addo.
 He is an ex-military engineer who from 2006 to 2010 served as the General Officer Commanding the Southern Command.
 He succeeded Baba Issifu Kamara, whos tenure ended on January 7, 2016. R.J. Harris
R.J. Harris (born June 3, 1992) is an American football wide receiver for the Winnipeg Blue Bombers of the Canadian Football League (CFL).
 He attended the University of New Hampshire. 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. Jane Amero
Jane A. Amero (born August 6, 1941) is an American teacher and politician from Maine.
 Amero, a Republican, served in the Maine State Senate from 1992-2000, representing her residence in Cape Elizabeth, Maine and nearby areas of Cumberland County.
 Prior to serving in the State Senate, Amero served in local government for 15 years, including 6 years on the Cape Elizabeth School Board and 9 years on the Cape Elizabeth Town Council.
 Amero also chaired the State Board of Education for three years.
 Amero served as the highest ranking elected Republican in Maine government from 1996 to 2000, when she was twice elected by her colleagues as Minority Leader of the Maine Senate.
 Unable to run again due to term-limits, Amero challenged Democrat Tom Allen for Congress in 2000.
 In a three way race which also featured Libertarian Party candidate Frederic Staples, Amero garnered 36.5% of the vote, losing to the incumbent Allen. Patricia Godchaux
Patricia "Pan" Godchaux is a moderate Republican who ran for the United States Congress for the 9th federal congressional district in the state of Michigan.
 She challenged seven-term incumbent Joe Knollenberg in the Republican primary and hoped to get Democratic support, as the Democrats' challenger, Nancy Skinner, didn't have to face a primary contest.
 She notes that the district is inclined to vote Republican, and that unless citizens of the district want to re-elect a conservative Republican, their best chance to avoid doing so was by placing a moderate on the ballot in November.
 Ultimately Gochaux failed in her attempt to unseat the seven-term incumbent, garnering 30% of the vote to Knollenberg's 70%, or 20,211 to 46,713 votes. Irene Griffin
Irene T. Griffin (July 25, 1899 – April 1983) was an American Republican Party politician who served in the New Jersey General Assembly.
 She served one year in the Legislature, but became a bit of a perennial candidate, losing three races for the Assembly, two for the Senate, and one for Congress.
 Griffin first ran for the State Assembly in 1942, but lost the Republican primary to future U.S. Senator Clifford P. Case, future State Senator Kenneth Hand, and two others.
 When Case ran for Congress in 1944, Griffin ran again and won the nomination and the election.
 She did run for a second term in 1945, but sought the Republican nomination for State Senator in 1947, losing to hand in the primary.
 She ran again for Assembly in 1951, but lost the primary to incumbent Florence P. Dwyer.
 She again challenged Dwyer in 1956, this time in a primary for the U.S. House of Representatives; she lost and Dwyer went on to unseat an incumbent in the general election.
 She ran for the Assembly in 1957, upsetting the frontrunner, Nelson Stamler in the Republican primary.
 She lost the General Election to Democrat Mildred Barry Hughes.
 Griffin lost a State Senate primary in 1962 to Stamler, who had since been elected Assemblyman.
 In 1967, she lost a Republican primary for State Assembly to Hugo Pfaltz and Peter J. McDonough by a 2-1 margin.