Question: What founder of the United Nations did Barry Goldwater credit for attributing to his United States Senate campaign victory due to his unpopularity?

Context paragraphs:
United States Senate election in Arizona, 1968: The 1968 United States Senate election in Arizona took place on November 5, 1968.  Incumbent Democratic U.S. Senator Carl Hayden did not run for reelection to an eighth term, with his longtime staff member Roy Elson running as the Democratic Party nominee to replace him.  Elson was defeated by a wide margin, however, by former U.S. Senator and Republican Presidential nominee Barry Goldwater.  Prior to Goldwater's election, the seat had been held for decades by the Democratic Party under Carl Hayden, and has thus far remained in Republican Party control since.

Millhouse (film): Millhouse: A White Comedy is a 1971 documentary by Emile de Antonio following Richard Nixon's political career from his election to the House of Representatives in 1946 to his election as President of the United States in 1968.  It begins with Nixon's "last press conference" in 1962 after his loss in the race for Governor of California in which he famously said, "You won't have Dick Nixon to kick around anymore."  Then a collage of videos show Nixon's trajectory from his House campaign to his involvement in the Alger Hiss case, election the Senate in 1950, election as Vice President in 1952 including the full Checkers speech, campaign for the presidency in 1960, campaign for Barry Goldwater's presidential candidacy in 1964, and his triumphant election as President in 1968 as the "New Nixon".  The film featured interviews but no voice-over.

United States Senate election in Arizona, 1974: The 1974 United States Senate election in Arizona took place on November 5, 1974.  Incumbent Republican U.S. Senator Barry Goldwater decided to run for reelection to a second consecutive term, after returning to the U.S. Senate in 1968 following his failed Presidential run in 1964 against Lyndon B. Johnson.  Goldwater defeated Democratic Party nominee philanthropist Jonathan Marshall in the general election.

Barry Goldwater presidential campaign, 1964: The Barry Goldwater presidential campaign of 1964 began when United States Senator Barry Goldwater of Arizona elected to seek the Republican Party nomination for President of the United States to challenge incumbent Democratic President Lyndon B. Johnson.  Early on, before officially announcing his candidacy for the presidency, Goldwater was accused by Governor of New York Nelson Rockefeller of attempting to galvanize Southern and Western Republican support while neglecting the industrial northern states, eventually becoming one of Goldwater's primary opponents in the race for the Republican Party's nomination in 1964.

Harry S. Truman: Harry S. Truman (May 8, 1884December 26, 1972) was the 33rd President of the United States (1945–53), assuming that office upon the death of Franklin D. Roosevelt during the waning months of World War II.  He is known for launching the Marshall Plan to rebuild the economy of Western Europe, for leading the Cold War against Soviet and Chinese communism by establishing the Truman Doctrine and NATO, and for intervening in the Korean War.  In domestic affairs, he was a moderate Democrat whose liberal proposals were a continuation of Franklin Roosevelt's New Deal, but the conservative-dominated Congress blocked most of them.  He used the veto power 180 times, more than any president since then, and saw 12 overridden by Congress; only Grover Cleveland and Franklin D. Roosevelt used the veto so often, and only Gerald Ford and Andrew Johnson saw so many veto overrides.  He is also the only world leader to have ever used nuclear weapons in war, desegregated the U.S. Armed Forces, supported a newly independent Israel, and was a founder of the United Nations.

United States Senate election in Arizona, 1958: The 1958 United States Senate elections in Arizona took place on November 4, 1958.  Incumbent Republican U.S. Senator Barry Goldwater ran for reelection to a second term, and defeated former U.S. Senator, and then-Governor, Ernest McFarland in the general election.  The election was a virtual rematch from 1952, where Goldwater defeated McFarland by a narrow margin.  Goldwater had attributed the win to the unpopularity of President Harry S. Truman and popular Wisconsin Senator Joseph McCarthy endorsing his campaign.

United States Senate election in Arizona, 1952: The 1952 United States Senate election in Arizona was held on November 4, 1952.  Incumbent Democratic U.S. Senator and Senate Majority Leader Ernest McFarland ran for re-election to a third term, but was defeated by the Republican nominee and future candidate for President of the United States, Barry Goldwater.

United States Senate election in Arizona, 1980: The 1980 United States Senate election in Arizona took place on November 4, 1980.  Incumbent Republican U.S. Senator Barry Goldwater decided to run for reelection to a third consecutive term, after returning to the U.S. Senate in 1968 following his failed Presidential run in 1964 against Lyndon B. Johnson.  Goldwater defeated Democratic Party nominee Bill Schulz in the general election, but only by a narrow margin, which later caused Goldwater to decide against running for reelection to a fourth consecutive term.

Goldwater v. Carter: Goldwater v. Carter, 444 U.S. 996 (1979), was a United States Supreme Court case which was the result of a lawsuit filed by Senator Barry Goldwater and other members of the United States Congress challenging the right of President Jimmy Carter to unilaterally nullify the Sino-American Mutual Defense Treaty, which the United States had signed with the Republic of China, so that relations could instead be established with the People's Republic of China.  Goldwater and his co-filers claimed that the President required Senate approval to take such an action, under of the U.S. Constitution, and that, by not doing so, President Carter had acted beyond the powers of his office.

Goldwater Institute: The Goldwater Institute is a Phoenix, Arizona-based conservative and libertarian public policy think tank.  The institute's stated mission is "to defend and strengthen the freedom guaranteed to all Americans in the constitutions of the United States and all fifty states."  The organization was established in 1988 with the support of former U.S. Senator Barry Goldwater.  The organization was primarily a public policy research organization until 2007, when it added a litigation arm, becoming the first state-based policy organization to do so.  Goldwater's litigation arm, the Scharf-Norton Center for Constitutional Litigation, engages in lawsuits against government entities across the United States.

Supporting paragraphs: United States Senate election in Arizona, 1958 Harry S. Truman
Answer: Harry S. Truman