mudslinging

[muhd-sling-ing]
noun
an attempt to discredit one's competitor, opponent, etc., by malicious or scandalous attacks.

Origin:
1880–85; mud + slinging

mudslinger, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mudslinging (ˈmʌdˌslɪŋɪŋ)
 
n
casting malicious slurs on an opponent, esp in politics
 
'mudslinger
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
We've lost some sanity in this mix of political mudslinging.
Please respond to this all who would intelligently, and without the usual
  mudslinging and sarcasm.
Opposition research has long been common in political campaigns, and it
  sometimes leads to mudslinging and unfair attacks.
We all know the level of dissatisfaction with the present leadership, and to
  engage in mudslinging would serve no purpose.
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