Question: Which politician was a Democrat, Daniel David Boren or Markwayne Mullin?
Context: Cheryll Boren Heinze (October 30, 1946 – July 10, 2012) was a Republican member of the Alaska House of Representatives from 2003 to 2005.  She comes from the Boren family of Oklahoma and Texas; she was first cousin to both Hoyt Axton and David Boren.  She was an artist outside politics. Carson Dobbins Boren (December 12, 1824 – August 19, 1912) was an early founder of Seattle, Washington (see Denny Party).  His sister Mary Ann was married to Arthur Denny, and his sister Louisa to David Denny.  Boren was the first King County Sheriff.  Seattle's Boren Avenue is named in his honor.  Although he was an important figure in the early years of Seattle, historian Junius Rochester writes that "The pioneering contributions of Carson Dobbins Boren to the founding of Alki (in future West Seattle) and Seattle began and ended within a short period of six years." Daniel David (born 23 November 1972 in Satu Mare, Romania) is an "Aaron T. Beck" professor of Clinical Psychology and Psychotherapy at the Babeş-Bolyai University, Cluj-Napoca, Romania.  He was the head of the Department of Clinical Psychology and Psychotherapy of the Babeş-Bolyai University between 2007 and 2012.  Daniel David is also an adjunct professor at Icahn School of Medicine at Mount Sinai and is the head of the Research Program at Albert Ellis Institute in New York. 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. 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. Daniel David "Dan" Rostenkowski (January 2, 1928 – August 11, 2010) was a United States Representative from Chicago, serving from 1959 to 1995.  He became one of the most powerful legislators in Washington, especially in matters of taxation, until he went to prison.  A Democrat and son of a Chicago alderman, Rostenkowski was for many years Democratic Committeeman of Chicago's 32nd Ward, retaining this position even while serving in Congress. 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. The Oklahoma gubernatorial election of 1974 was held on November 5, 1974, and was a race for the Governor of Oklahoma.  Demcorat David Boren defeated Clem McSpadden in a run-off to claim his party's nomination after embattled incumbent David Hall was eliminated in the initial primary.  Boren won the general election handily over Republican Jim Inhofe. The family is one of the most notable in Oklahoma, producing Democratic politicians including Lyle Boren (1909–1992), U.S. Representative for Oklahoma's 4th district from 1937 to 1947, his son David Boren (born 1941), Governor of Oklahoma from 1975 to 1979, U.S. Senator from 1979 to 1994, and current President of the University of Oklahoma since 1994, and his grandson Dan Boren (born 1973), a Blue Dog who was the U.S. Representative for Oklahoma's 2nd district from 2005 to 2013. 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).
Answer: Dan Boren