Where did the dessert watergate salad get it's name?

Watergate Salad

There are a couple of suggested theories as to the source of this salad...see the
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Pistachios have been enjoyed as the start of time. They have generally considered luxury items. In the 20th century, technological advances made them more accessible to home cooks. Culinary facts confirms these nuts were most repeatedly used to flavor ice creams and parfaits. They were also sometimes used in pates, salads (toppings, molded in combination with other ingredients gelatine), baked goods, and candy. Notes on pistachios and their use in cookery here.

Even though salads and cakes made flavored with pistachios date back to the early 20th century, culinary evidence connects the recipes we know today as Watergate Salad and Watergate Cake to the Kraft Company, dating from the mid 1970s. Why the Kraft connection? Both recipes use pistachio instantaneous pudding mix, which was introduced by Kraft Foods in 1975.

Conclusins here The real answer is nobody knows!!

Watergate Salad