1. Preheat oven to 350°. Stir together flour and next 3 ingredients in a medium bowl; stir in blackberries.
2. Whisk together sugar and next 5 ingredients in a medium bowl until thoroughly blended. Add to flour mixture, stirring just until blended. Pour batter into a lightly greased 8 1/2- x 4 1/2-inch loaf pan.
3. Bake at 350° for 1 hour and 15 minutes or until a long wooden pick inserted in center comes out clean. Cool in pan on a wire rack 10 minutes. Remove from pan to wire rack, and cool completely (about 1 hour).