这场政治辩论很快变成了相互诽谤，双方都在进行无休止的人身攻击。

The political debate quickly turned into mutual defamation, with both sides engaged in endless ___mudslinging.

政治竞选中的互相抹黑只会让选民感到厌倦。

The constant ___mudslinging in political campaigns just makes voters tired.