The infamous blue dress
In November 1997, Monica Lewinsky told her confidant and supposed friend, Linda Tripp, that she had in her possession a blue Gap dress that still bore the semen stain that resulted from her administering oral sex to President Clinton in February of that year.
Tripp called her literary agent, and fellow Clinton-hater, Lucianne Goldberg to report the news that evidence existed in Lewinsky's closet that could prove a sexual relationship between Monica and the President. Goldberg and Tripp, according to published reports in both Time and Newsweek, discussed stealing the dress and turning it over to investigators. Goldberg admitted having such a discussion with Tripp, calling it a "Nancy Drew fantasy."
In late November, Lewinsky mentioned to Tripp that she intended to have the dress, which she had been saving a souvenir, dry-cleaned for a family event. Tripp, anxious to preserve the dress to nail the President, discouraged her from doing so. "I would tell my own daughter," Tripp told her, that she should save the dress "for your own ultimate protection" should she later be accused of lying about the affair with Clinton. When Lewinsky expressed skepticism that it would ever come to that, Tripp told her that the dress made her look "really fat" and she shouldn't wear it again in public.
In late July, 1998, Lewinsky turned the dress over to Kenneth Starr's investigators after signing an immunity agreement. A blood sample was taken from Clinton on August 3, and on August 17, the FBI reported its conclusion that Clinton was the source of the semen on the dress "to a reasonable degree of scientific certainty."
When news of the the existence of the dress surfaced in published reports in early August, politicians and commentators alike agreed that the blue dress proved Clinton lied when he denied a sexual relationship with Lewinsky. Senator Orrin Hatch (R-Utah) called the evidence "very critical." Senator Arlen Spector (R-Pa) agreed that it would be "the most powerful kind of corroboration" of an affair. A George Washington law professor, Jonathan Turley, appearing on "Meet the Press" said of the semen stain: "No one will be able to spin him out of that."