Question: Ralph J. Marra Jr took over what American politician's position as the United States Attorney for the District of New Jersey when they resigned in December 2008?

Context paragraphs:
Ralph J. Marra Jr.: Ralph J. Marra Jr. (born c. 1953) is an American lawyer who served as the Acting United States Attorney for the District of New Jersey.  He held this position from the resignation of Chris Christie in December 2008 until the appointment of Paul J. Fishman in October 2009.  In January 2010, after Christie became Governor of New Jersey, Marra was appointed to a top legal position in the New Jersey Sports and Exposition Authority.

Joshua Minkler: Joshua Minkler is an American attorney.  Currently serving as the interim United States Attorney for the United States District Court for the Southern District of Indiana, he has been nominated by President Donald Trump to become the permanent U.S. Attorney for the same district.  Prior to becoming interim U.S. Attorney in June 2015, Minkler served for 21 years as an Assistant U.S. Attorney in the Southern District of Indiana, where he held the positions of First Assistant United States Attorney and Chief of the Drug and Violent Crime Unit.  Before he joined the U.S. Attorney's office, Minkler served for five years as an assistant prosecuting attorney in the office of the Kent County, Michigan prosecuting attorney, where he prosecuted violent crimes.

George J. Terwilliger III: George J. Terwilliger III (born June 5, 1950) is an American lawyer and politician.  He is a partner in the Washington, D.C. office of McGuireWoods LLP and is a former United States Deputy Attorney General and acting United States Attorney General.  Terwilliger, of Vermont, was nominated on February 14, 1992, by President George H.W. Bush to be Deputy Attorney General at the U.S. Department of Justice.  He would succeed William Pelham Barr.  As Deputy Attorney General, Terwilliger became the second-highest-ranking official in the United States Department of Justice (DOJ) and ran the day-to-day operations of the Department, serving in that position from 1991 through 1993.  He was appointed to the position after serving as the United States Attorney for the District of Vermont.  In addition, he currently serves on the Advisory Board of Intellaine, LLP, a U.S. defense and risk engineering firm located in Arlington, Virginia.

Carlie Christensen: Carlie Christensen was the acting United States Attorney for the District of Utah until President Barack Obama was nominated and the U.S. Senate confirmed Republican David B. Barlow.  She holds a bachelor's degree from Westminster College (Utah) and a law degree from the University of Utah.  She was a staff attorney in the office of the US Attorney for the District of Utah for 19 years before becoming the United States attorney.  She once again became the Acting U.S. Attorney after Barlow resigned in April 2014.

Kevin J. O'Connor (attorney): Kevin J. O'Connor serves as general counsel at Point72 Asset Management.  Previously, he served as an attorney appointed by President George W. Bush and was unanimously confirmed by the United States Senate as Connecticut’s 48th United States Attorney in 2002.  From January to April 2006, O'Connor served as Associate Deputy Attorney General of the United States.  In 2007, O'Connor served as Chief of Staff to United States Attorney General Alberto R. Gonzales.  In 2008, O'Connor was unanimously confirmed as Associate Attorney General of the United States, the number three position at the U.S. Department of Justice (DOJ), a post he held until 2009, when he left the DOJ to join the law firm of Bracewell and Giuliani.

Frank S. Katzenbach: Frank Snowden Katzenbach, Jr. (November 5, 1868 – March 13, 1929) was an American jurist and Democratic party politician from New Jersey.  He was an Associate Justice of the New Jersey Supreme Court and was the Democratic nominee for Governor of New Jersey in 1907.  He was the brother of New Jersey Attorney General Edward L. Katzenbach and uncle of Nicholas Katzenbach, the United States Attorney General.

Frank Putnam Flint: Frank Putnam Flint (July 15, 1862February 11, 1929) Born in North Redding, Massachusetts.  In 1869 his family moved to San Francisco, California, where he attended public schools.  He had asthma.  In 1888 he moved to Orange, then Los Angeles, California.  On February 25, 1890, he married Katherlne J. Bloss in Los Angeles; and they had 2 children, a girl about 1892, and boy about 1894.  Also in 1890, he was appointed a clerk in the United States marshal's office in Los Angeles, and began to study law.  In 1892 he was appointed assistant United States attorney under Mathew Thompson Allen.  In 1883 he resigned and formed a law partnership with Allen, Allen & Flint, which lasted 2 years until Allen became a Judge.  In 1895, Flint and Donald Barker reformed the law firm as Flint & Barker.  In 1897 Flint was appointed United States attorney for the southern district of California, and served 4 years.  Flint was active in Republican politics.  He was a fruit-grower, politician and banker.

Chris Christie: Christopher James Christie (born September 6, 1962) is an American politician, lobbyist, and attorney.  He is a member of the Republican Party and has been the 55th Governor of New Jersey since January 2010.  His second and final term ends on January 16, 2018.

William W. Mercer: William W. Mercer was a United States Attorney for the District of Montana, as well as Principal Associate Deputy Attorney General for the United States Department of Justice.  In September 2006, Mercer was nominated by George W. Bush as Associate Attorney General, served as Acting Associate Attorney General until June 22, 2007; he resigned from that position days before his confirmation hearing was to take place and returned to his United States attorney position in Montana.

William E. Purcell: William Edward Purcell (August 3, 1856November 23, 1928) was a United States Senator from North Dakota.  Born in Flemington, New Jersey, he attended the common schools, studied law, and was admitted to the bar of New Jersey in 1880, commencing practice in Flemington.  He moved to Wahpeton, Dakota Territory, in 1881 and continued the practice of law; in 1888 he was appointed by President Grover Cleveland as United States attorney for the Territory of Dakota.  He resigned in 1889, having been elected a member of the constitutional convention for the new State of North Dakota.  From 1889 to 1891 he was district attorney of Richland County, North Dakota and was a member of the North Dakota Senate from 1907 to 1909.

Supporting paragraphs: Ralph J. Marra Jr. Chris Christie
Answer: Chris Christie