Sentence:  The Humphrey campaign had been able to undo a <WSD>ratfuck</WSD> at the last minute by getting a notice into the Saturday Milwaukee Sentinel saying there would be no free lunch that afternoon with the candidate and Lorne Green of Bonanza, as advertised in a flyer circulated in the ghetto. 
Meaning of the word marked with <WSD> tags:  An act of sabotage or dirty tricks