Question: Who is the Minnesota senator that was married to Muriel Humphrey and served as the 38th Vice President of the United States?
Context: Muriel Fay Buck Humphrey Brown (February 20, 1912 September 20, 1998) was an American politician who served as the Second Lady of the United States and as a U.S. Senator from Minnesota Married to the 38th Vice President of the United States, Hubert Humphrey.  Following her husband's death, she was appointed to his seat in the United States Senate, thus becoming the only Second Lady of the United States to hold public office.  She later remarried and took the name Muriel Humphrey Brown. The Hubert Humphrey presidential campaign of 1968 began when Vice President of the United States Hubert Humphrey of Minnesota decided to seek the Democratic Party nomination for President of the United States following the announcement by President Lyndon B. Johnson that he would not seek the party's nomination.  Johnson had been stalled by the anti-Vietnam War candidacy of Senator Eugene McCarthy of Minnesota, who along with Senator Robert F. Kennedy of New York, became the main opponents for Humphrey.  The contest between the men featured a battle for control of the Democratic Party, and cast Humphrey's "old politics", against the "new politics" of McCarthy and Kennedy.  The main cause of the division was the Vietnam War, which intensified during Humphrey's tenure as Vice President and grew increasingly unpopular. The presidency of Gerald Ford began on August 9, 1974, when Gerald Ford became President of the United States, and ended on January 20, 1977, a span of days.  Ford, the 38th United States president, succeeded Richard Nixon, who had resigned from office.  Prior to this he was the 40th Vice President of the United States, serving from 1973 until President Richard Nixon's resignation in 1974.  He was the first person appointed to the vice presidency under the terms of the Twenty-fifth Amendment to the United States Constitution, following the resignation of Vice President Spiro Agnew on October 10, 1973.  Ford has the distinction of being the first, and to date the only person to have served as both vice president and president without being elected to either office. The president pro tempore of the United States Senate ( or ), also president pro tem, is the second-highest-ranking official of the United States Senate.  of the United States Constitution provides that the Vice President of the United States is, despite not being a senator, the President of the Senate, and mandates that the Senate must choose a president "pro tempore" to act in the Vice President's absence.  Unlike the vice president, the president pro tempore is an elected member of the Senate, able to speak or vote on any issue.  Selected by the Senate at large, the president pro tempore has enjoyed many privileges and some limited powers.  During the vice president's absence, the president pro tempore is empowered to preside over Senate sessions.  In practice, neither the vice president nor the president pro tempore usually presides; instead, the duty of presiding officer is rotated among junior senators of the majority party to give them experience in parliamentary procedure. 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. Hubert Horatio Humphrey, 38th Vice President of the United States (1965–1969), United States Senator from Minnesota (1949–1964 and 1971–1978), 35th Mayor of Minneapolis, Minnesota (1945–1948). The 1960 presidential campaign of John F. Kennedy, a United States Senator from Massachusetts, began on January 2, 1960, when Kennedy formally announced his candidacy for 35th President of the United States, replacing incumbent President of the United States Dwight D. Eisenhower.  Kennedy was nominated by the Democratic Party at the Democratic National Convention of 1960, taking place between July 11 and July 15, 1960.  On July 15, 1960, Kennedy named Senator Lyndon B. Johnson of Texas as his official running mate.  Kennedy and Johnson won the election on November 8, 1960, defeating incumbent Vice President and Republican nominee Richard Nixon, who would later go on to be the 37th President of the United States.  Kennedy and Johnson were sworn in as 35th President and 37th Vice President of the United States on January 20, 1961 respectively.  Kennedy would serve as President of the United States until his death in November 1963. Hubert Humphrey (1911–1978) was the 38th Vice President of the United States. Electoral history of Gerald Ford, 38th President of the United States (1974–1977), 40th Vice President of the United States (1973–1974); United States Representative from Michigan (1949–1973). Gerald Rudolph Ford Jr. (born Leslie Lynch King Jr.; July 14, 1913 – December 26, 2006) was an American politician who served as the 38th President of the United States from August 1974 to January 1977, following the resignation of Richard Nixon.  Prior to this he served eight months as the 40th Vice President of the United States, following the resignation of Spiro Agnew.  He was the first person appointed to the vice presidency under the terms of the 25th Amendment, and consequently the only person to have served as both Vice President and President of the United States without being elected to executive office.  Before his appointment to the vice presidency, Ford served 25 years as U.S. Representative from Michigan's 5th congressional district, the final nine of them as the House Minority Leader.
Answer: Hubert Humphrey