In a large skillet over low heat, cook bacon until crisp; drain. Break each slice of bacon into 4 pieces. Cook pasta according to pkg. directions using 2 tsp. salt; drain. Cool to room temperature. In a large mixing bowl, combine pasta, tomatoes, onion, cheese, 1 tsp. salt and dressing; refrigerate to blend flavors. Just before serving, carefully fold in bacon, romaine and croutons.
Note: If the salad is made ahead and refrigerated, the pasta will absorb the dressing. Keep additional dressing on hand to moisten the salad before serving.