Bending the rules here slightly, as Donald Segretti wasn't a politician.
He was a political operative and the head coordinator of "dirty tricks" for Richard Nixon's pre-Watergate Presidential campaign.
All The President's Men
, a nervy, stripy-knit wearing Sergretti is portrayed by Robert Walden.
As Segretti wasn't involved in the illegal, morally bankrupt fest of Watergate, he almost gains our sympathy when Carl Bernstein (Dustin Hoffman) is interrogating him over a cup of coffee.
That is until he believes he's done nothing wrong in distributing forged campaign literature and reveals he did worst things in student election campaigns.
The term he uses for his dirty tactics is "ratfucking".