James K. Polk was the first "dark horse" to be elected President of the United States.
At the Democratic National Convention in 1844, Polk was suggested as a compromise candidate when a STALEMATE developed between former President Martin Van Buren and Lewis Cass - on the eighth ballot. Polk, who was nominated on the ninth ballot, had not even been mentioned during the first seven ballots.
Polk, James Knox "Young Hickory" (1795-1849) American politician, 11th President of the United States (1845-1849) noted for his administration's establishment of the 49th parallel as the country's northern border (1846)
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stale-mate noun
1. A situation in which further action is blocked; a deadlock.
2. A drawing position in chess in which the king, although not in check, can move only into check and no other piece can move.
From Middle English, probably from Anglo-Norman estale, fixed position, from Old French estal
Source: The American Heritage® Dictionary of the English Language, Fourth Edition