Question: Who is this retired American politician who was a U. S. representative of Oklahoma's 2nd Congressional District whom Oklahoma politician Jim Wilson ran against during the July 27 Democratic primary?

full_context: Document 1: David L. Boren: David Lyle Boren (born April 21, 1941) is an American university administrator and politician from the state of Oklahoma. A member of the Democratic Party, he served as the 21st governor of Oklahoma from 1975 to 1979 and in the United States Senate from 1979 to 1994. He is currently the 13th president of the University of Oklahoma. He was the longest serving chairman of the Senate Select Committee on Intelligence. David Boren officially announced his retirement as president of the University of Oklahoma, effective June 30, 2018.
Document 2: United States Senate election in Oklahoma, 2002: The 2002 United States Senate election in Oklahoma was held on November 5, 2002. Incumbent Republican U.S. Senator Jim Inhofe won re-election to a second term.
Document 3: Ben Ray Luján: Ben Ray Luján (born June 7, 1972) is an American politician and the U.S. Representative for New Mexico 's 3 congressional district , serving since 2009. He is a member of the Democratic Party. The district is based in Santa Fe, the state capital, and includes most of the northern portion of the state. Luján became the Chairman of the Democratic Congressional Campaign Committee on November 18, 2014.
Document 4: Chris Wilson (pollster): Chris Wilson (born October 24, 1968 in Lawton, Oklahoma) is a Republican American pollster and political strategist who has conducted hundreds of public opinion studies for over 100 of the Fortune 500, influential associations, foundations, elected leaders of the U.S. Senate, U.S. House of Representatives and state governments.
Document 5: Dan Boren: Daniel David Boren (born August 2, 1973) is a retired American politician, who served as the U.S. Representative for Oklahoma 's 2 congressional district from 2005 to 2013. The district includes most of the eastern part of the state outside of Tulsa. He is a member of the Democratic Party.
Document 6: Oklahoma gubernatorial election, 2006: The Oklahoma gubernatorial election of 2006 was held on November 7, 2006, and was a race for the Governor of Oklahoma. The incumbent Governor, Democrat Brad Henry, was re-elected with more than 60 percent of the vote, beating Republican Ernest Istook, a member of the United States House of Representatives (Congressional district 5). As of 2017, this is the most recent election in which a Democrat has been elected Governor of Oklahoma.
Document 7: Oklahoma gubernatorial election, 1978: The 1978 Oklahoma gubernatorial election was held on November 7, 1978, to elect the Governor of Oklahoma. Incumbent Republican Governor David L. Boren chose not to run for re-election to a second term in office. Instead Boren decided to run for the United States Senate. Former Governor, and sitting Lieutenant Governor George Nigh was elected, defeating Republican nominee Ron Shotts.
Document 8: Oklahoma gubernatorial election, 1994: The Oklahoma gubernatorial election of 1994 was held on November 8, 1994, and was a race for the Governor of Oklahoma. Former United States Associate Attorney General Frank Keating pulled an upset in the three-way race to become only the third Republican governor in Oklahoma history. This can largely be attributed to the split Democratic vote between nominee Jack Mildren and former Democratic congressman Wes Watkins. Watkins' performance in the election, obtaining 24% of the vote and carrying several counties, is one of the most notable performances for a third party candidate in modern U.S. history.
Document 9: Don Bacon (politician): Donald John Bacon (born August 16, 1963) is a retired United States Air Force Brigadier General and current U.S. Representative for Nebraska's 2nd congressional district.
Document 10: Jim Wilson (Oklahoma politician): Jim Wilson was an Oklahoma Senator from District 3, which includes Adair, Cherokee and Sequoyah counties, from 2004 to 2012. He earlier was a member of the Oklahoma House of Representatives from 2000 through 2004. He ran unsuccessfully against Democratic Incumbent US Rep. Dan Boren in Oklahoma's 2nd Congressional District in the July 27 Democratic primary.
Document 11: Jim Inhofe: James Mountain Inhofe ( ; born November 17, 1934) is the senior United States senator from Oklahoma and a member of the Republican Party. First elected to the Senate in 1994, he was the ranking member of the United States Senate Committee on Environment and Public Works (EPW) and was its chairman from 2003 to 2007, and again from January 2015 until January 2017. Inhofe served eight years as the United States representative for 2=nd
Document 12: United States Senate election in Oklahoma, 2016: The 2016 United States Senate election in Oklahoma was held on November 8, 2016 to elect a member of the United States Senate to represent the State of Oklahoma, concurrently with the 2016 U.S. presidential election, as well as other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections. The primaries were held on June 28.
Document 13: Allen Williamson: Allen Williamson (fl. c. 1970) is a former Oklahoma politician who served in the Oklahoma House of Representatives from 1966 to 1974. He is related to James Allen Williamson, an Oklahoma State Senator elected in 1996.
Document 14: Markwayne Mullin: Markwayne Mullin (born July 26, 1977) is an American politician and businessman who has been the United States representative for Oklahoma's 2nd congressional district since 2013. He owns several businesses, which he took over at twenty, when his father became ill. Mullin, a member of the Republican Party, was elected to the U.S. House of Representatives in the 2012 elections, succeeding Democratic representative Dan Boren.
Document 15: David Boswell (Kentucky politician): David E. Boswell is a former Democratic member of the Kentucky Senate, having represented the 8th District from 1990 to 2011. Earlier he was a member of the Kentucky House of Representatives from 1978 through 1983. In 1983, he defeated Republican Richard Turner to be elected Agriculture Commissioner of Kentucky with 64%. In 1987, he was a candidate for Lieutenant Governor unsuccessfully in the Democratic Primary on a ticket paired with Grady Stumbo. The Stumbo-Boswell ticket came in fourth. He returned the political arena and was the 2008 Democratic nominee for U.S. Representative for Kentucky's 2nd Congressional District, and lost to Republican nominee Brett Guthrie. The congressional seat became open because of the retirement of Republican Ron Lewis.
ground_truth: Dan Boren