Blue Cheese Salad Dressing

2 c. mayonnaise
1 tsp. lemon juice
1 tsp. vinegar
1/4 c. buttermilk
1/2 c. sour cream
1/2 tsp. salt
1/4 tsp. pepper
1/4 tsp. garlic powder
1 (4 oz.) pkg. blue cheese, crumbled

Combine all ingredients except blue cheese; blend well. Gently stir in blue cheese. Refrigerate until needed. Makes about 3 cups.