Preheat oven to 350 F. Soak raisins in warm water for 20 minutes to plump them. In a large bowl, combine dry ingredients. In a small bowl, beat eggs and stir in sour cream. Add the egg mixture to the dry ingredients, and stir with a wooden spoon or use hands. Stir in the raisins and caraway seeds. Place dough in a greased 9-inch springform pan. Dust the top with flour to prevent hands from sticking, and pat the dough evenly in the pan. With a knife, make a shallow crisscross slash on the top. Bake for 50 minutes.