短语讲解：

1. For example, an individual can only give a candidate a total of $2,700 each election.

a total of 总数为
例句：The book has three parts with a total of fifteen chapters.
本书共分三个部分，十五个章节。

2. The election rule bans campaigns and super PACs from working together.

work together 共事
例句：Let us sink our differences and work together.
让我们忘记我们的歧见而共同工作。

3. To get to the White House, a candidate must be able to run a 50 state campaign.

be able to 能够
例句：How I hope to be able to show you what I feel!
我多么希望我能让你看出我现在的感情！