ダークホースは英語でも dark horse です。0:05 there's a young airmail pilot hastens to be the first to fly nonstop from New York to Paris. he hopes to capture a $25,000 prize for which the world's top aviators are competing. his name is Charles A. Lindbergh. he's the dark horse for the TransAtlantic Air Race.
Stock Footage - CHARLES LINDBERGH. SPIRIT OF ST. LOUIS. CROWDS / PERSON PLANE
https://www.youtube.com/watch?v=5TGdDpOTIds 1:39 the dark horse in the Democratic field remains Vice President Joe Biden. 民主党で大番狂わせの可能性があるのはやはり副大統領のバイデン氏です。
Rivals Slam Trump; Sanders Closes Clinton Gap