Watergate Salad

2 pkg. (4oz serving size each) Jello Pistachio Flavor Instant Pudding
2 cans (20 oz each) crushed pineapple in juice undrained
2 cups Jet-Puffed Miniature Marshmallows
1 cup Planters pecans
3 cups (8 oz tub) thawed Cool Whip

Mix dry pudding mix, pineapple, marshmallows and pecans in a large bowl until well blended. Gently stir in Cool Whip; cover. Refridgerate 1 hour or until ready to serve. Garnish with additional Cool Whip and chopped pecans if desired.