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Context: Lyndon Baines Johnson, often referred to by his initials LBJ, was an American politician who served as the 36th president of the United States from 1963 to 1969. He previously served as the 37th vice president from 1961 to 1963 under President John F. Kennedy, and was sworn in shortly after Kennedy's assassination. A Democrat from Texas, Johnson also served as a U.S. representative, U.S. Senator and the Senate's majority leader. He holds the distinction of being one of the few presidents who served in all elected offices at the federal level.

Answer: Lyndon Baines Johnson (1908–1973) was an American politician,  a Democrat from Texas, who served as the 36th president of the United States from 1963 to 1969, 37th vice president from 1961 to 1963 under President John F. Kennedy,