1856 United States presidential election in the context of "United States Ambassador to the United Kingdom"

John Cabell Breckinridge (January 16, 1821 – May 17, 1875) was an American politician who served as the 14th vice president of the United States, with President James Buchanan, from 1857 to 1861. Assuming office at the age of 36, Breckinridge is the youngest vice president in U.S. history. He was also the Southern Democratic candidate in the 1860 presidential election, losing to antislavery Republican candidate Abraham Lincoln.

Breckinridge was born near Lexington, Kentucky, to a prominent local family. After serving as a noncombatant during the Mexican–American War, he was elected as a Democrat to the Kentucky House of Representatives in 1849, where he took a pro-slavery stance. Elected to the U.S. House of Representatives in 1851, he allied with Stephen A. Douglas in support of the Kansas–Nebraska Act. After reapportionment in 1854 made his re-election unlikely, he declined to run for another term. He was nominated for vice president at the 1856 Democratic National Convention to balance a ticket headed by James Buchanan. The Democrats won the election, but Breckinridge had little influence with Buchanan, and as presiding officer of the Senate, could not express his opinions in debates. He joined Buchanan in supporting the proslavery Lecompton Constitution for Kansas, which led to a split in the Democratic Party. In 1859, he was elected to succeed Senator John J. Crittenden at the end of Crittenden's term in 1861.

Major-General John Charles Frémont (January 21, 1813 – July 13, 1890) was a United States Army officer, explorer, and politician. He was a United States senator from California and was the first Republican nominee for president of the U.S. in 1856 and founder of the California Republican Party upon being nominated. Frémont lost the election to Democrat James Buchanan.

A native of Georgia, he attended the College of Charleston for two years until he was expelled after irregular attendance. In the 1840s, Frémont led five expeditions into the western states. During this time, he directed several massacres of the indigenous peoples in California as part of the California genocide. During the Mexican–American War, he was a major in the United States Army and took control of a portion of California north of San Francisco from the short-lived California Republic in 1846. Frémont was court-martialed and convicted of mutiny and insubordination after a conflict over who was the rightful military governor of California. His sentence was commuted, and he was reinstated by President James K. Polk, but Frémont resigned from the Army. Afterwards, he settled in California at Monterey while buying cheap land in the Sierra foothills. Gold was found on his Mariposa ranch, and Frémont became a wealthy man during the California Gold Rush. He became one of the first two U.S. senators elected from the new state of California in 1850.

Gerrit Smith (March 6, 1797 – December 28, 1874), also spelled Gerritt Smith, was an American social reformer, abolitionist, businessman, public intellectual, and philanthropist. Married to Ann Carroll Fitzhugh, Smith was a candidate for President of the United States in 1848, 1856, and 1860. He served a single term in the House of Representatives from 1853 to 1854.

First valedictorian of the new Hamilton College (1818), and married to the daughter of the college president, he had "a fine mind", with "a strong literary bent and a marked gift for public speaking". He was called "the sage of Peterboro." He was well liked, even by his political enemies. The many who appeared at his house in Peterboro, invited or not, were well received. (In 1842 the names of 132 visitors were recorded.)

The 1856 Democratic National Convention was a presidential nominating convention that met from June 2 to June 6 in Cincinnati, Ohio. It was held to nominate the Democratic Party's candidates for president and vice president in the 1856 election. The convention selected former Secretary of State James Buchanan of Pennsylvania for president and former Representative John C. Breckinridge of Kentucky for vice president.

Incumbent Democratic President Franklin Pierce's standing with the public had been badly damaged by "Bleeding Kansas," the civil strife in Kansas Territory over slavery. Many dissatisfied Democrats lined up behind Buchanan, who had served as Pierce's ambassador to Britain and thus had avoided the controversy over Bleeding Kansas, while a smaller group of Democrats supported Senator Stephen A. Douglas of Illinois. Buchanan led on the first ballot and slowly grew his support on subsequent ballots, leading Pierce to instruct his delegates to back Douglas. Douglas agreed to withdraw his name after receiving assurances that Buchanan would not seek re-election in 1860, allowing Buchanan to clinch the nomination on the seventeenth ballot. Pierce became the first and only elected president who was an active candidate for reelection to be denied his party's nomination for a second term.