running mate

1. N-COUNT In an election campaign, a candidate's running mate is the person that they have chosen to help them in the election. If the candidate wins, the running mate will become the second most important person after the winner. 競選夥伴[美國英語]

...Clinton's selection of Al Gore as his running mate. …尅林頓選擇阿爾•戈爾作爲他的競選夥伴。