Chocolate Marshmallow Chow

1 c Miniature marshmallows
1/3 c Chocolate chips
1 Stick diet margarine
9 c Wheat Chex cereal
1/2 c Powdered sugar
1/2 c Raisins Melt margarine, marshmallows, raisins and chocolate chips. Pour mixture over cereal and toss. Put mixture into paper bag and add powdered sugar. Shake until all cereal is covered.