Combine first 5 ingredients in a large bowl; set aside.
Combine buttermilk, butter, and raisins; add to flour mixture, stirring until moistened.
Turn dough out onto a well-floured surface, and knead until smooth and elastic (about 5 minutes). Place on a greased baking sheet.
Press dough evenly into a 1 1/2-inch-thick circle.
Bake at 325° for 1 hour or until bread sounds hollow when tapped. Remove to a wire rack; cool 5 minutes. Cut into wedges.