stylistic:tone
1960 presidential election

On January 2, 1960, Kennedy announced his candidacy for the Democratic presidential nomination. Though some questioned Kennedy's age and experience, his charisma and eloquence earned him numerous supporters. Kennedy faced several potential challengers, including Senate Majority Leader Lyndon Johnson, Adlai Stevenson II, and Senator Hubert Humphrey.

Kennedy traveled extensively to build his support. His campaign strategy was to win several primaries to demonstrate his electability to the party bosses, who controlled most of the delegates, and to prove to his detractors that a Catholic could win popular support. Victories over Senator Humphrey in the Wisconsin and West Virginia primaries gave Kennedy momentum as he moved on to the 1960 Democratic National Convention in Los Angeles.

When Kennedy entered the convention, he had the most delegates, but not enough to ensure that he would win the nomination. Stevenson—the 1952 and 1956 presidential nominee—remained very popular, while Johnson also hoped to win the nomination with support from party leaders. Kennedy's candidacy also faced opposition from former President Harry S. Truman, who was concerned about Kennedy's lack of experience. Kennedy knew that a second ballot could give the nomination to Johnson or someone else, and his well-organized campaign was able to earn the support of just enough delegates to win the presidential nomination on the first ballot.

Kennedy ignored the opposition of his brother Robert, who wanted him to choose labor leader Walter Reuther, and other liberal supporters when he chose Johnson as his vice-presidential nominee. He believed that the Texas senator could help him win support from the South. In accepting the presidential nomination, Kennedy gave his well-known " New Frontier " speech:

For the problems are not all solved and the battles are not all won—and we stand today on the edge of a New Frontier.... But the New Frontier of which I speak is not a set of promises—it is a set of challenges. It sums up not what I intend to offer the American people, but what I intend to ask of them.

At the start of the fall general election campaign, the Republican nominee and incumbent Vice President Richard Nixon held a six-point lead in the polls. Major issues included how to get the economy moving again, Kennedy's Catholicism, the Cuban Revolution, and whether the space and missile programs of the Soviet Union had surpassed those of the U.S. To address fears that his being Catholic would impact his decision-making, he told the Greater Houston Ministerial Association on September 12: "I am not the Catholic candidate for president. I am the Democratic Party candidate for president who also happens to be a Catholic. I do not speak for my Church on public matters—and the Church does not speak for me." He promised to respect the separation of church and state, and not to allow Catholic officials to dictate public policy.

The Kennedy and Nixon campaigns agreed to a series of televised debates. An estimated 70 million Americans, about two-thirds of the electorate, watched the first debate on September 26. Kennedy had met the day before with the producer to discuss the set design and camera placement. Nixon, just out of the hospital after a painful knee injury, did not take advantage of this opportunity and during the debate looked at the reporters asking questions and not at the camera. Kennedy wore a blue suit and shirt to cut down on glare and appeared sharply focused against the gray studio background. Nixon wore a light-colored suit that blended into the gray background; in combination with the harsh studio lighting that left Nixon perspiring, he offered a less-than-commanding presence. By contrast, Kennedy appeared relaxed, tanned, and telegenic, looking into the camera whilst answering questions. It is often claimed that television viewers overwhelmingly believed Kennedy, appearing to be the more attractive of the two, had won, while radio listeners (a smaller audience) thought Nixon had defeated him. However, only one poll split TV and radio voters like this and the methodology was poor. Pollster Elmo Roper concluded that the debates raised interest, boosted turnout, and gave Kennedy an extra two million votes, mostly as a result of the first debate. The debates are now considered a milestone in American political history—the point at which the medium of television began to play a dominant role.

Kennedy's campaign gained momentum after the first debate, and he pulled slightly ahead of Nixon in most polls. On Election Day, Kennedy defeated Nixon in one of the closest presidential elections of the 20th century. In the national popular vote, by most accounts, Kennedy led Nixon by just two-tenths of one percent (49.7% to 49.5%), while in the Electoral College, he won 303 votes to Nixon's 219 (269 were needed to win). Fourteen electors from Mississippi and Alabama refused to support Kennedy because of his support for the civil rights movement; they voted for Senator Harry F. Byrd of Virginia, as did an elector from Oklahoma. Forty-three years old, Kennedy was the youngest person ever elected to the presidency (though Theodore Roosevelt was a year younger when he succeeded to the presidency after the assassination of William McKinley in 1901).