To prepare the mousse, combine all ingredients in the bowl of a food processor and puree until creamy, about 2 minutes. Transfer the mousse to a bowl, cover, and refrigerate.
To prepare the raspberry sauce, combine 1 1/2 cups of raspberries and the remaining ingredients in the bowl of a food processor and puree until smooth. Strain the raspberry sauce through a fine strainer (rubbing with a rubber spatula to work through the mesh) into a small bowl. Mix in the remaining 1 cup of whole raspberries, cover, and refrigerate for about 15 minutes.
Spoon a 1-inch deep layer of mousse into long, narrow parfait glasses or small glass dessert bowls, spreading out evenly. Top with a layer of raspberry sauce. Repeat, ending with a layer of mousse. Chill for at least 20 minutes. Garnish with some whole raspberries and a mint leaf.