Tuscon Black Bean Salsa

3 tablespoons corn oil
1 1/4 cups fresh corn kernels or frozen, thawed
1 16-ounce can black beans, rinsed, drained
1 15-ounce can Great Northern white beans, drained
1 cup chopped red bell pepper
3/4 cup chopped red onion
2 tablespoons fresh lime juice
3 large garlic cloves, pressed
1 large jalapeño chili, seeded, minced
1 tablespoon minced fresh oregano or 1 teaspoon dried
1 tablespoon cholula
1 tablespoon chili powder
1 1/2 teaspoons ground cumin