annavc, yes I think you are right.
I was thinking of the Daniel Ellsburg burglary which was where Nixon's team broke into the office of his phyciatrist and it became part of the Watergate "bigger picture".
The wiki site for Ellsburg says:
In one of Nixon's actions against Ellsberg, G. Gordon Liddy and E. Howard Hunt, members of the White House Special Investigation Unit (also called the "White House Plumbers") broke into Ellsberg's psychiatrist's office in September 1971, hoping to find information they could use to discredit him. The revelation of the break-in became part of the Watergate scandal. Due to the gross governmental misconduct, all charges against Ellsberg were eventually dropped. White House counsel Charles Colson was later prosecuted and pled no contest for obstruction of justice in the burglary of Ellsberg's psychiatrist's office.
http://en.wikipedia.org/wiki/Daniel_Ellsberg