Combine broth and tomatoes in slow cooker. Sprinkle flour evenly over bottom of small skillet. Cook over high heat without stirring 3 to 4 minutes or until flour begins to brown. Reduce heat to medium; stir flour about 4 minutes. Stir in until smooth. Carefully whisk flour mixture into slow cooker.
Add sausage, onion, bell pepper, celery, carrots, oregano, thyme and red pepper to slow cooker. Cover and cook on low 4 1/2 to 5 hours or until juices are thickened.
About 30 minutes before gumbo is ready to serve, prepare rice. **Hint- I buy individual serving bags of rice, that way there is nothing wasted. Serve gumbo over rice. For a special touch sprinkle chopped parsley over each serving.