Preheat oven to 400°F (200°C).

Grease a 9 x 13-inch baking pan.

In a large bowl, cream together the sugar, oleo (or butter), and eggs until light and fluffy.

In a separate small bowl, add the baking soda to the sour milk and stir.

Pour the sour milk mixture into the creamed mixture and combine well.

In a separate bowl, whisk together the cornmeal, flour, and salt.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Pour the batter into the prepared baking pan, spreading evenly.

Bake in the preheated oven for 30-40 minutes, or until the edges are golden brown and pulled away from the pan, and a toothpick inserted into the center comes out clean.