Republican candidates

• 
  President of the United States
  Dwight D. Eisenhower
  from Pennsylvania
  (1953–1961)
• 
  Montana Secretary of State
  S. C. Arnold
  from Montana
  (1955–1957)
• 
  Senator
  John W. Bricker
  from Ohio
  (1947–1959)
• 
  Senator
  William Knowland
  from California
  (1945–1959)
• 
  Governor
  Joe Foss
  from South Dakota
  (1955–1959)

Early in 1956, there was speculation that President Eisenhower would not run for a second term because of concerns about his health. In 1955, Eisenhower had suffered a serious heart attack. However, he soon recovered and decided to run for a second term. (In June 1956 he also underwent surgery for ileitis) Given Eisenhower's enormous popularity, he was renominated with no opposition at the 1956 Republican National Convention in San Francisco.

According to Steven Ambrose, Nixon was anguished that Eisenhower never liked him and had repeatedly delayed saying Nixon should be renominated for vice president. Ambrose also stated that Eisenhower favored Robert B. Anderson, a former Democrat who had served as United States Secretary of the Navy and United States Deputy Secretary of Defense, but Anderson declined to be considered. With Eisenhower worried about his health, he decided that Nixon had his shortcomings, but was better prepared to assume the presidency than any possible alternative. In Ambrose's view, "In itself, that was the highest possible tribute he could pay Nixon.”^[6] Harold Stassen was the only Republican to publicly oppose Nixon's re-nomination for vice president, and Nixon remained highly popular among the Republican rank-and-file voters. Nixon had worked hard to reshape the vice presidency. It became his platform to campaign for Republican state and local candidates across the country, and these candidates came to his defense. In the spring of 1956, Eisenhower publicly announced that Nixon would again be his running mate, and Stassen was forced to second Nixon's nomination at the Republican Convention. Unlike 1952, conservative Republicans (who had supported Robert A. Taft against Eisenhower in 1952) did not attempt to shape the platform. At the convention, Nebraska delegate Terry McGovern Carpenter voted for a fictitious "Joe Smith" for vice president to prevent a unanimous vote.^[7]

Democratic candidates

• Former Governor
  Adlai Stevenson II
  from Illinois
  (1949–1953)
• Senator
  Estes Kefauver
  from Tennessee
  (1949–1963)
• Governor
  W. Averell Harriman
  from New York
  (1955–1958)

Primaries

Adlai Stevenson, the Democratic Party's 1952 nominee, fought a tight primary battle with populist Tennessee Senator Estes Kefauver for the 1956 nomination. Kefauver won the New Hampshire primary unopposed (though Stevenson won 15% on write-ins). After Kefauver upset Stevenson in the Minnesota primary, Stevenson, realizing that he was in trouble, agreed to debate Kefauver in Florida. Stevenson and Kefauver held the first televised presidential debate on May 21, 1956, before the Florida primary.^[8] Stevenson carried Florida by a 52–48% margin. By the time of the California primary in June 1956, Kefauver's campaign had run low on money and could not compete for publicity and advertising with the well-funded Stevenson. Stevenson won the California primary by a 63–37% margin, and Kefauver soon withdrew from the race.

Democratic National Convention

At the 1956 Democratic National Convention in Chicago, New York Governor W. Averell Harriman, who was backed by former President Harry S. Truman, challenged Stevenson for the nomination. However, Stevenson's delegate lead was much too large for Harriman to overcome, and Stevenson won on the first ballot.

The roll call, as reported in Richard C. Bain and Judith H. Parris, Convention Decisions and Voting Records, pp. 294–298:

Vice-presidential nomination

The highlight of the 1956 Democratic Convention came when Stevenson, to create excitement for the ticket, made the surprise announcement that the convention's delegates would choose his running mate. This set off a desperate scramble among several candidates to win the nomination. Potential vice presidential candidates had only one hectic day to campaign among the delegates before the voting began. The two leading contenders were Senator Kefauver, who retained the support of his primary delegates, and Senator John F. Kennedy from Massachusetts, who was not well known at the time. Although Stevenson privately preferred Senator Kennedy to be his running mate, he did not attempt to influence the balloting for Kennedy in any way. Kennedy surprised the experts by surging into the lead on the second ballot; at one point, he was only 15 votes shy of winning. However, a number of states then left their "favorite son" candidates and switched to Kefauver, giving him the victory. Kennedy then gave a gracious concession speech. The defeat was a boost for Kennedy's long-term presidential chances: as a serious contender, he gained favorable national publicity, yet by losing to Kefauver he avoided blame for Stevenson's loss to Eisenhower in November. The vote totals in the vice presidential balloting are recorded in the following table, which also comes from Bain & Parris.

Campaign

Stevenson campaigned hard against Eisenhower, with television ads for the first time being the dominant medium for both sides. Eisenhower's 1952 election victory had been due in large part to winning the female vote; hence, during this campaign there was a plethora of "housewife"-focused ads. Some commentators at the time also argued that television's new prominence was a major factor in Eisenhower's decision to run for a second term at the age of 66, considering his weak health after the heart attack in 1955. Television allowed Eisenhower to reach people across the country without enduring the strain of repeated coast-to-coast travel, making a national campaign more feasible.^[10]

Stevenson proposed significant increases in government spending for social programs and treaties with the Soviet Union to lower military spending and end nuclear testing on both sides. He also proposed to end the military draft and switch to an "all-volunteer" military. Eisenhower publicly opposed these ideas, even though in private he was working on a proposal to ban atmospheric nuclear testing. Eisenhower had retained the enormous personal and political popularity he had earned during World War II, and he maintained a comfortable lead in the polls throughout the campaign.

Eisenhower was also helped by his handling of two developing foreign-policy crises that occurred in the weeks before the election. In the Soviet-occupied People's Republic of Hungary, many citizens had risen in revolt in the Revolution of 1956 against Soviet domination, but the Soviets responded by invading the country on October 26. Three days later, a combined force of Israeli, British, and French troops invaded Egypt to topple Gamal Abdel Nasser and seize the recently nationalized Suez Canal. The resolution of the latter crisis rapidly moved to the United Nations,^[11] and the Hungarian revolt was brutally crushed within a few days by re-deployed Soviet troops. Eisenhower condemned both actions, but was unable to help Hungary; he did, however, forcefully pressure the western forces to withdraw from Egypt.

While these two events led many Americans to rally in support of the president and swelled his expected margin of victory, the campaign was seen differently by some foreign governments.^[12] The Eisenhower administration had also supported the Brown v. Board of Education ruling in 1954; this ruling by the U.S. Supreme Court ended legal segregation in public schools. Meanwhile, Stevenson voiced disapproval about federal court intervention in segregation, saying about Brown that "we don't need reforms or groping experiments."^[13] This was an about-face from the national Democratic party platform's endorsement of civil rights in the 1948 campaign. Although Eisenhower "avoid[ed] a clear stand on the Brown decision" during the campaign,^[14] in the contest with Stevenson, he won the support of nearly 40% of black voters; he was the last Republican presidential candidate to receive such a level of support from black voters.

Results

Eisenhower led all opinion polls by large margins throughout the campaign. On Election Day Eisenhower took over 57% of the popular vote and won 41 of the 48 states. Stevenson won only six Southern states and the border state of Missouri, becoming the first losing candidate since William Jennings Bryan in 1900 to carry Missouri. Eisenhower carried Louisiana, making him the first Republican presidential candidate to carry the state, or any state in the Deep South for that matter, since Rutherford Hayes had done so in 1876 during Reconstruction, Eisenhower was the first Republican to win two presidential terms since William McKinley in 1900.

Eisenhower, who had won in twenty-one of the thirty-nine cities with a population above 250,000 in the 1952 election, won in twenty-eight of those cities in the 1956 election. He had won six of the eight largest cities in the Southern United States in the 1952 election and won seven of them with Atlanta being the only one to remain Democratic.^[15]

Of the 3,101 counties/independent cities making returns, Eisenhower won the most popular votes in 2,143 (69.11%) while Stevenson carried 924 (29.80%). Unpledged Electors prevailed in 32 counties (1.03%) while Andrews carried two counties (0.06%).

This election was the last in which Massachusetts voted Republican until 1980 and the last in which Connecticut, Maryland, Michigan, Minnesota, New York, Pennsylvania, Rhode Island, Texas, and West Virginia did so until 1972. Conversely this was the last election in which Mississippi voted Democratic until 1976, and is also the last election until 1976 when Alabama gave a majority of its electoral votes to the Democratic candidate. As of 2023, this remains the last time that Missouri, Arkansas, Mississippi, Alabama, South Carolina, and North Carolina would back a losing Democratic presidential candidate.

In 9 Southern states, a slate of third party options emerged as a protest to the civil rights movement. This was a continuation of the former Dixiecrat party from 1948. The states of Tennessee, Arkansas, Texas, and Virginia went a step farther, nominating Thomas Andrews for president, meanwhile in Kentucky they nominated senator Harry Byrd for president. The remaining states of Mississippi, South Carolina, Alabama, and Louisiana, left their electors as “Unpledged”.

Source (Popular Vote): Leip, David. "1956 Presidential Election Results". Dave Leip's Atlas of U.S. Presidential Elections. Retrieved August 1, 2005.Source (Electoral Vote): "Electoral College Box Scores 1789–1996". National Archives and Records Administration. Retrieved August 1, 2005.

• Results by county, shaded according to winning candidate's percentage of the vote
• Results by districts, shaded according to winning candidate's percentage of the vote

Results by state

Source: ^[16]

Close states

Margin of victory less than 1% (24 electoral votes):

1. Missouri, 0.22% (3,984 votes)
2. Tennessee, 0.62% (5,781 votes)

Margin of victory less than 5% (14 electoral votes):

1. North Carolina, 1.33% (15,468 votes)

Margin of victory over 5%, but under 10% (46 electoral votes)

1. Arkansas, 6.64% (26,990 votes)
2. Minnesota, 7.60% (101,777 votes)
3. West Virginia, 8.16% (67,763 votes)
4. Washington, 8.47% (97,428 votes)
5. Kentucky, 9.09% (95,739 votes)

Tipping point state:

1. New Mexico, 16.00% (40,690 votes)

^(a) Alabama faithless elector W. F. Turner, who was pledged to Adlai Stevenson and Estes Kefauver, instead cast his votes for Walter Burgwyn Jones, who was a circuit court judge in Turner's home town, and Herman Talmadge, governor of the neighboring state of Georgia.

Because of the admission of Alaska and Hawaii as states in 1959, the 1956 presidential election was the last in which there were 531 electoral votes.