Santa Fe Clam Chowder

Name: Santa Fe Clam Chowder
Ingredients: 1 celery stalk, chopped; 1 cup canned crushed tomatoes with added puree; 1 cup frozen white corn kernels; 1 garlic clove, minced; 1 medium onion, chopped; 1 teaspoon dried oregano; 1 teaspoon ground cumin; 1/3 cup canned diced green chilies; 12 ounces white skinned potatoes, peeled, cut into 1/2 inch cubes; 2 tablespoons extra virgin olive oil; 24 littleneck clams, scrubbed; 3 8 ounce bottles clam juice; 4 ounces Spanish chorizo * or andouille sausage, cut into 1/3 inch dice; 6 tablespoons chopped fresh cilantro