The presidential candidate made three mistakes, or gaffes, during his speech.

校长候选人在演讲中出了三次错，或失态。

youdao

The running mate is the presidential candidate's choice for vice president. The front-runner is the leading candidate.

对于竞选副校长这个竞选伙伴是竞选副校长的机会，一路领先的人是最主要的候选人。

youdao

A third presidential candidate emerged to mount a serious challenge and throw the campaign wide open.

第3位总统候选人上场郑重发出挑战，令这次竞选充满悬念。

《柯林斯英汉双解大词典》

And Tyler - a Whig - hoped that Calhoun might be able to get him nominated as the presidential candidate of the Democratic Party.

VOA: special.2009.02.05

The Democratic Party chose for its presidential candidate a hero of the Civil War -- General Winfield Scott Hancock of Pennsylvania.

VOA: special.2010.04.22

In the presidential election of eighteen-sixty, he supported his party's candidate, not the candidate of the Republican Party: Abraham Lincoln.

VOA: special.2010.01.21

But Kerry the presidential candidate had caved to Democrat pressure groups: unions and tree huggers.

FORBES: Whither the Democrats

President Obama (in contrast to the Presidential candidate Obama) was a victim of unfortunate timing.

NEWYORKER: Replay

For the presidential candidate of the (ostensible) party of economic growth, this is criminal.

FORBES: Why Mitt Romney Deserved To Lose The Election