Voyeur

Voyeur is a full motion video game that was created by Philips for their CD-i console in 1993.  It was then ported to DOS and Mac in 1994.  In the game, you are a private investigator that is hired to spy on the house of a wealthy man who is planning to run for president of the United States, trying to find information that will incriminate him.  The ending depends on how much evidence you found and how you acted upon it.