Preheat oven to 375. Spray 8-inch diameter cake pan with nonstick spray. Whisk flour, 4 tablespoons sugar, baking powder, salt, and baking soda in large bowl to blend. Add butter. Using fingertips, rub in until coarse meal forms. Make well in center of flour mixture. Add buttermilk. Gradually stir dry ingredients into milk to blend. Mix in raisins.