Dark horse

A dark horse is a previously lesser-known person, team or thing that emerges to prominence in a situation, especially in a competition involving multiple rivals,^[1] that is unlikely to succeed but has a fighting chance,^[2] unlike the underdog who is expected to lose.

The term comes from

The term began as horse racing parlance for a race horse that is unknown to gamblers and thus difficult to establish betting odds for.

The first known mention of the concept is in Benjamin Disraeli's novel The Young Duke (1831). Disraeli's protagonist, the Duke of St. James, attends a horse race with a surprise finish: "A dark horse which had never been thought of, and which the careless St. James had never even observed in the list, rushed past the grandstand in sweeping triumph."^[3]

This section may contain excessive or irrelevant examples. Please help improve the article by adding descriptive text and removing less pertinent examples. (March 2023)

The concept has been used in political contexts in such countries as Iran,^[4] Philippines,^[5] Russia,^[6] Egypt, Finland,^[7] Canada,^[8] the United Kingdom,^[9] and the United States.

Politically, the concept came to the United States in the nineteenth century when it was first applied to James K. Polk, a relatively unknown Tennessee politician who won the Democratic Party's 1844 presidential nomination over a host of better-known candidates. Polk won the nomination on the ninth ballot at his party's national nominating convention, and went on to become the country's eleventh president.

Other successful dark horse candidates for the United States presidency include:

• Franklin Pierce, chosen as the Democratic nominee and later elected the fourteenth president in 1852.
• Abraham Lincoln, chosen as the Republican nominee and elected as the sixteenth president in 1860.
• Rutherford B. Hayes, elected the nineteenth president in 1876.
• Secretary of the Treasury John Sherman. However, his party's national nominating convention became deadlocked due to a split in the delegates between former Republican president Ulysses S. Grant, Senator James G. Blaine, and Sherman. The party sought a compromise candidate, and they opted to select Garfield over the latter's own objections. Garfield, however, would be assassinated
  just six months into his term.
• Warren G. Harding, Senator from Ohio, elected the twenty-ninth president in 1920 after his surprise nomination.
• Harry S. Truman, Vice-President and former Senator from Missouri and thirty-third president, was virtually unknown to the American people when he succeeded President Franklin D. Roosevelt in 1945. Truman was considered a lame duck President with no chance of winning against the immensly popular Republican nominee and New York Governor Thomas E. Dewey, yet managed to shock the world by emerging victorious in the 1948 United States presidential election – widely considered one of the biggest upsets in American history.
• nomination over rivals with more national prominence. At the 1976 Democratic National Convention
  Carter made a joke of his obscurity beginning his speech saying "My name is Jimmy Carter, and I'm running for President."

Perhaps the two most famous unsuccessful dark horse presidential candidates in American history are Democrat William Jennings Bryan, a three-term congressman from Nebraska nominated on the fifth ballot after impressing the 1896 Democratic National Convention with his famous Cross of Gold speech (Bryan would go on to receive the Democratic presidential nomination twice more and serve as United States Secretary of State), and Republican businessman Wendell Willkie, who was nominated on the sixth ballot at the 1940 Republican National Convention despite never having previously held government office and having only joined the party in 1939. U.S. Senator Bernie Sanders is another classic example of a dark horse candidate, whose grassroots campaign in the 2016 Democratic Party presidential primaries came much closer than initially expected to toppling front-runner Hillary Clinton for the party's presidential nomination.

In

• Black swan theory
• Stalking horse
• Underdog