Why is an unknown contestant called a “dark horse”?

Sam Flynn, a travelling Tennessee horse trader, often found a horse race planned in the same town as an auction. So he mixed a coal black racing stallion named Dusky Pete in with his workhorses, then quietly entered him in the local races and wagered heavily on Dusky Pete, who would invariably win. As word spread of Sam’s deception, so did the caution: “Beware the dark horse.”

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