Title: Presidency of Lyndon B. Johnson
Content:  The office of vice president remained vacant during Johnson's first (-day partial) term, as at the time there was no way to fill a vacancy in the vice presidency. Johnson selected Senator Hubert Humphrey of Minnesota, a leading liberal, as his running mate in the 1964 election, and Humphrey served as vice president throughout Johnson's second term. Led by Senator Birch Bayh and Representative Emanuel Celler, Congress, on July 5, 1965, approved an amendment to the Constitution addressing succession to the presidency and establishing procedures both for filling a vacancy in the office of the vice president, and for responding to presidential disabilities. It was ratified by the requisite number of states on February 10, 1967, becoming the Twenty-fifth Amendment to the United States Constitution.
Title: Lyndon Baines Johnson Day
Content:  Senator John F. Kennedy of Massachusetts to be his running mate. They went on to win the election and Johnson was sworn in as Vice President on January 20, 1961. Two years and ten months later, on November 22, 1963, Johnson succeeded Kennedy as President following the latter's assassination. He ran for a full term in the 1964 election, winning by a landslide over Republican Arizona Senator Barry Goldwater. He is one of four people who have served as President, Vice President, and in both houses of Congress. The other three who have served in all four elected offices were John Tyler, Andrew Johnson (no relation to Lyndon), and (Lyndon's successor as president) Richard Nixon.
Title: Presidency of John F. Kennedy
Content:  and Senator Lyndon B. Johnson of Texas to win the presidential nomination on the first ballot of the convention. Kennedy chose Johnson to be his vice-presidential running mate, despite opposition from many liberal delegates and Kennedy's own staff, including his brother Robert F. Kennedy. Kennedy believed that Johnson's presence on the ticket would appeal to Southern voters, and he thought that Johnson could serve as a valuable liaison to the Senate. Incumbent Vice President Richard Nixon faced little opposition for the 1960 Republican nomination. He easily won the party's primaries and received the nearly-unanimous backing of the delegates at 
Title: Marriott Wardman Park
Content: President Lyndon B. Johnson for about 45 days as Vice President of the United States ; Vice President of the United States Spiro Agnew ; Vice President of the United States Charles Curtis ; Actress Marlene Dietrich ; Senator Bob Dole ; President of the United States Dwight D. Eisenhower ; Former airline Trans World Airlines (TWA) President Jack Frye and wife, Helen ; U.S. Attorney Paul M. Gagnon ; Senator Barry Goldwater ; Secretary of State Cordell Hull ; President of the United States Herbert Hoover ; Socialite Perle Mesta ; Senator Chuck Robb ; Chief Justice Frederick M. Vinson ; Vice President of the United States Henry A. Wallace ; Chief Justice 
Title: Lyndon B. Johnson
Content:   That same year, Robert F. Kennedy was widely considered an impeccable choice to run as Johnson's vice presidential running mate but Johnson and Kennedy had never liked one another and Johnson, afraid that Kennedy would be credited with his election as president, abhorred the idea and opposed it at every turn. Kennedy was himself undecided about the position and, knowing that the prospect rankled Johnson, was content to eliminate himself from consideration. Ultimately, Goldwater's poor polling numbers degraded any dependence Johnson might have had on Kennedy as his running mate. Hubert Humphrey's selection as vice president then became a 
Title: List of vice presidents of the United States
Content:  Twenty-six vice presidents held other high state or federal government positions after leaving the vice presidency. Fifteen went on to become president: John Adams, Thomas Jefferson, Martin Van Buren, John Tyler, Millard Fillmore, Andrew Johnson, Chester A. Arthur, Theodore Roosevelt, Calvin Coolidge, Harry S. Truman, Richard Nixon, Lyndon B. Johnson, Gerald Ford, George H. W. Bush and Joe Biden (nine of them did so following their predecessor's death or resignation); and six served in the Senate: John C. Calhoun, John C. Breckinridge, Hannibal Hamlin, Andrew Johnson, Alben W. Barkley and Hubert Humphrey. Several served as a member of the U.S. Cabinet or as an ambassador in later administrations, or in state government.
Title: List of vice presidents of the United States
Content:  Gerald Ford succeeded to the presidency. The amendment also established a procedure whereby a vice president may, if the president is unable to discharge the powers and duties of the office, temporarily assume the powers and duties of the office as acting president. Three vice presidents have briefly acted as president under the 25th Amendment: George H. W. Bush on July 13, 1985; Dick Cheney on June 29, 2002 and on July 21, 2007; and Kamala Harris on November 19, 2021. The persons who have served as vice president were born in or primarily affiliated with 27 states plus the District of Columbia. New 
Title: Presidency of Lyndon B. Johnson
Content:   Johnson represented Texas in the United States Senate from 1949 to 1961, and served as the Democratic leader in the Senate beginning in 1953. He sought the 1960 Democratic presidential nomination, but was defeated by John F. Kennedy. Hoping to shore up support in the South and West, Kennedy asked Johnson to serve as his running mate, and Johnson agreed to join the ticket. In the 1960 presidential election, the Kennedy-Johnson ticket narrowly defeated the Republican ticket led by Vice President Richard Nixon. Johnson played a frustrating role as a powerless vice president, rarely consulted except specific issues such as the space program. Kennedy was assassinated on November 22, 1963, while riding in a presidential motorcade through Dallas. Later that day, Johnson took the presidential oath of office aboard Air 
Title: 1960 Democratic Party vice presidential candidate selection
Content:  sent his brother, Robert F. Kennedy, to talk Johnson out of accepting the offer. However, Kennedy may have made the offer in earnest due to Johnson's appeal in the south, Johnson's friendly relationship with Speaker of the House Sam Rayburn, and Kennedy's desire to remove Johnson as Senate Majority Leader in favor of the more liberal Mike Mansfield. Regardless, Johnson decided that accepting the offer would be better for his political career and better position himself to become president, and so he chose to become Kennedy's running mate. The Democratic convention confirmed Johnson as the vice presidential nominee, although the delegation from Washington, D.C. attempted to select Minnesota Governor Orville Freeman instead. The Kennedy-Johnson ticket narrowly defeated incumbent Vice President Richard Nixon and his running mate, former Massachusetts Senator Henry Cabot Lodge, in the 1960 election. Johnson ascended to the presidency in 1963 upon the assassination of Kennedy.
Title: Presidency of Gerald Ford
Content:  Ford's accession to the presidency left the office of vice president vacant. On August 20, 1974, Ford nominated Nelson Rockefeller, the leader of the party's liberal wing, for the vice presidency. Rockefeller and former Congressman George H. W. Bush of Texas were the two finalists for vice presidential nomination, and Ford chose Rockefeller in part due to a Newsweek report that revealed that Bush had accepted money from a Nixon slush fund during his 1970 Senate campaign. Rockefeller underwent extended hearings before Congress, which caused embarrassment when it was revealed he made large gifts to senior aides, including Kissinger. Although conservative Republicans were not pleased that Rockefeller was picked, most of them voted for his confirmation, and his nomination passed both the House and Senate. He was sworn in as the nation's 41st vice president on December 19, 1974. Prior to Rockefeller's confirmation, Speaker of the House Carl Albert was next in line to the presidency. Ford promised to give Rockefeller a major role in shaping the domestic policy of the administration, but Rockefeller was quickly sidelined by Rumsfeld and other administration officials.

Question: who was vice president when jfk was president?
Answer: Lyndon B. Johnson.