Question: Was the president who appointed Thomas C. Mann a democrat or a republican?

full_context: Document 1: Thomas Graham Jr. (diplomat): Ambassador Thomas Graham Jr. is a former senior U.S. diplomat. Graham was involved in the negotiation of every single international arms control and non-proliferation agreement from 1970 to 1997. This includes the Strategic Arms Limitation Talks (SALT Treaties), the Strategic Arms Reduction Treaties (START Treaties), the Anti-ballistic missile (ABM) Treaty, Intermediate-Range Nuclear Forces Treaty (INF) Treaty, Treaty on the Non-Proliferation of Nuclear Weapons Treaty (NPT), Treaty on Conventional Armed Forces in Europe (CFE) Treaty and Comprehensive Nuclear-Test-Ban Treaty (CTBT). In 1993, Ambassador Graham served as Acting Director of the Arms Control and Disarmament Agency (ACDA) from January to November, 1993 and Acting Deputy Director from November, 1993 to July, 1994. From 1994 through 1997, he was president Bill Clinton's special representative for Arms Control, Non-Proliferation, and Disarmament. Graham successfully led the U.S. government efforts to achieve the permanent extension of the NPT in 1995. Graham also served for 15 years as the general counsel of ACDA. Throughout his career, Thomas Graham has worked with six U.S. Presidents including Presidents Richard Nixon, Gerald Ford, Jimmy Carter, Ronald Reagan, George H. W. Bush, and Bill Clinton. Ambassador Graham worked on the negotiation of the Chemical Weapons Convention and the Biological Weapons Convention and managed the Senate approval of the ratification of the Geneva Protocol banning the use of chemical and biological weapons in war, as well as the Biological Weapons Convention.
Document 2: Robert McNamara: Robert Strange McNamara (June 9, 1916 – July 6, 2009) was an American business executive and the eighth Secretary of Defense, serving from 1961 to 1968 under Presidents John F. Kennedy and Lyndon B. Johnson. He played a major role in escalating the United States involvement in the Vietnam War. McNamara was responsible for the institution of systems analysis in public policy, which developed into the discipline known today as policy analysis.
Document 3: Thomas Schelling: Thomas Crombie Schelling (April 14, 1921 – December 13, 2016) was an American economist and professor of foreign policy, national security, nuclear strategy, and arms control at the School of Public Policy at University of Maryland, College Park. He was also co-faculty at the New England Complex Systems Institute. He was awarded the 2005 Nobel Memorial Prize in Economic Sciences (shared with Robert Aumann) for "having enhanced our understanding of conflict and cooperation through game-theory analysis".
Document 4: United States presidential election, 1964: The United States presidential election of 1964 was the 45th quadrennial presidential election. It was held on Tuesday, November 3, 1964. Democratic candidate and incumbent President Lyndon B. Johnson had come to office less than a year earlier following the assassination of his predecessor John F. Kennedy. Johnson, who had successfully associated himself with Kennedy’s popularity, won 61.1% of the popular vote, the highest win by a candidate since James Monroe’s re-election in 1820. It was the most lopsided US presidential election in terms of popular votes, and the tenth-most lopsided presidential election in the history of the United States in terms of electoral votes. No candidate for president since has equalled or surpassed Johnson’s percentage of the popular vote, and since 1820, only Abraham Lincoln in 1864, Franklin D. Roosevelt in 1936, Richard Nixon in 1972 and Ronald Reagan in 1980 and 1984 have won by a greater electoral vote margin.
Document 5: Thomas C. Mann: Thomas Clifton Mann (November 11, 1912 – January 23, 1999) was an American diplomat who specialized in Latin American affairs. He entered the U.S. Department of State in 1942 and quickly rose through the ranks to become an influential establishment figure. He worked to influence the internal affairs of numerous Latin American nations, typically focusing on economic and political influence rather than direct military intervention. After Lyndon B. Johnson became President in 1963, Mann received a double appointment and was recognized as the U.S. authority on Latin America. In March 1964, Mann outlined a policy of supporting regime change and promoting the economic interests of U.S. businesses. This policy, which moved away from the political centrism of Kennedy's Alliance for Progress, has been called the Mann Doctrine. Mann left the State Department in 1966 and became a spokesperson for the Automobile Manufacturer's Association.
Document 6: Gustavo Martínez Cabañas: Gustavo Martínez Cabañas (6 July 1911 – 2003) was a Mexican public administrator and economist. In 1949, he was appointed the first Executive Secretary of the Economic Commission for Latin America and the Caribbean (ECLAC), but remained in that position for only a year and was replaced by Raúl Prebisch. He also worked at the National Autonomous University of Mexico as Professor of Public Administration and Economics, and in various consulting capacities with the United Nations, the Committee to Reform Mexico's Public Administration, the Organization of American States (OAS) and the Inter-American Development Bank. He has written many papers, reports and financial studies dealing mainly with different aspects of Mexico's economy and public administration.
Document 7: Presidency of Lyndon B. Johnson: The presidency of Lyndon B. Johnson began on November 22, 1963, when Johnson became the 36th President of the United States upon the assassination of President John F. Kennedy, and ended on January 20, 1969. He had been Vice President of the United States for days when he succeeded to the presidency. A Democrat, he ran for and won a full four-year term in the 1964 election, winning by a landslide over Republican opponent Arizona Senator Barry Goldwater. Following the 1968 presidential election he was succeed by Republican Richard Nixon.
Document 8: USS Lyndon B. Johnson: USS "Lyndon B. Johnson" (DDG-1002) will be the third and final "Zumwalt"-class destroyer built for the United States Navy. The contract to build her was awarded to Bath Iron Works located in Bath, Maine, on 15 September 2011. The award, along with funds for the construction of USS "Michael Monsoor" , was worth US$1.826 billion. On 16 April 2012, Secretary of the Navy Ray Mabus announced the ship would be named "Lyndon B. Johnson" in honor of Lyndon B. Johnson, who served as the 36th President of the United States from 1963 to 1969. Johnson served in the Navy during World War II, when he was awarded the Silver Star, and ultimately reached the U.S. Naval Reserve rank of commander. DDG-1002 is the 34th ship named by the Navy after a U.S. president.
Document 9: The Wise Men (book): The Wise Men: Six Friends and the World They Made is a 1986 book by Walter Isaacson and Evan Thomas. It describes the actions of a group of US government officials and members of the East Coast foreign policy establishment. Starting in the immediate post-World War II period, the group developed the containment policy of dealing with the Communist bloc during the Cold War. They also helped to craft institutions and initiatives such as NATO, the World Bank, and the Marshall Plan. An updated edition of the book was released in 2012, as well as a "Quicklet" summary of the book.
Document 10: Lyndon B. Johnson: Lyndon Baines Johnson ( ; August 27, 1908January 22, 1973), often referred to as LBJ, was an American politician who served as the 36th President of the United States from 1963 to 1969, assuming the office after serving as the 37th Vice President of the United States from 1961 to 1963. A Democrat from Texas, he also served as a United States Representative and as the Majority Leader in the United States Senate. Johnson is one of only four people who have served in all four federal elected positions.
Document 11: Electoral history of Lyndon B. Johnson: Electoral history of Lyndon B. Johnson, the 36th President of the United States (1963–1969), 37th Vice President of the United States (1961–1963); United States Senator (1949–1961) and United States Representative (1937–1949) from Texas.
Document 12: Clark Clifford: Clark McAdams Clifford (December 25, 1906October 10, 1998) was an American lawyer who served as an important political adviser to Democratic Presidents Harry S. Truman, John F. Kennedy, Lyndon B. Johnson and Jimmy Carter. His official government positions were White House Counsel (1946–1950), Chairman of the President's Intelligence Advisory Board (1963–1968), and Secretary of Defense (1968–1969); Clifford was also influential in his role as an unofficial, informal presidential adviser in various issues. A successful Washington lawyer, he was known for his elite clientele, charming manners and impeccable suits.
Document 13: Hubert Humphrey: Hubert Horatio Humphrey Jr. (May 27, 1911January 13, 1978) was an American politician who served as the 38th Vice President of the United States from 1965 to 1969. Humphrey twice served in the United States Senate, representing Minnesota from 1949 to 1964 and 1971 to 1978. He was the Democratic Party's nominee in the 1968 presidential election, losing to the Republican nominee Richard Nixon.
Document 14: John F. Kennedy: John Fitzgerald "Jack" Kennedy (May 29, 1917 – November 22, 1963), commonly referred to by his initials JFK, was an American statesman who served as the 35th President of the United States from January 1961 until his assassination in November 1963. Kennedy served at the height of the Cold War, and much of his presidency focused on managing relations with the Soviet Union. He was a member of the Democratic Party who represented Massachusetts in the United States House of Representatives and the United States Senate prior to becoming president.
Document 15: Lyndon Baines Johnson Library and Museum: The Lyndon Baines Johnson Library and Museum, also known as the LBJ Presidential Library, is the presidential library and museum of Lyndon Baines Johnson, the 36th President of the United States (1963–1969). It is located on the grounds of the University of Texas at Austin, and is one of 13 Presidential Libraries administered by the National Archives and Records Administration. The LBJ Library houses 45 million pages of historical documents, including the papers of President Johnson and those of his close associates and others.
ground_truth: Democrat