In a large bowl,beat the butter until creamy and smooth. With the mixer on low speed, slowly add the sugar and mix. Add the eggs and beat until light and fluffy. In a medium bow,sift the flour, baking soda, baking powder, and salt together. Alternately add the flour mixture to the butter-sugar mixture with the sour cream. Flour first, sour cream, flour, sour cream and finally flour. Beating only till ingredients are just incorporated with each addition. Stir in the raisins.