nominees for presidential challenger的用法和樣例：
例句
- The men running for president took to the stump to attract votes.
總統競選人到各地巡迴演說拉選票。 - The American civil rights leader Jesse Jackson has apologized for what he called "regretfully crude" remarks he made about the Democratic presidential contender Barack Obama.
美國黑人人權領袖傑克遜為其對民主黨總統競選人奧巴馬所做的粗鄙言論表示道歉。
