Question: What was the political party of the president that Eugene V. Rostow served under?
Sentence (from "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.
Relevant evidence: No