In medium saucepan combine raisins, cranberries, sugar, cornstarch and allspice. Gradually stir in orange juice.
Bring to a boil over high heat; reduce heat to low and simmer; stirring until cranberries begin to pop and mixture thickens slightly.
Pour into shallow 1-1/2-quart baking dish.
To prepare topping:
In small bowl, combine flour, sugar, baking powder and salt. Cut in butter until mixture resembles coarse crumbs. Mix in milk lightly with fork. Drop spoonfuls of batter over filling; sprinkle lightly with additional sugar mixed with a little cinnamon. Bake in preheated 400 degree oven about 25 minutes or until golden.