Blue Cheese Dressing

From The Palm Restaurant Cookbook.  They suggest using Danish or French blue cheese.  The better the blue cheese, the better the dressing.

4 ounces blue cheese, at room temperature
1/2 cup olive oil
1/2 cup mayonnaise
1 1/2 tablespoons red wine vinegar

Crumble the blue cheese into a bowl and whisk in the olive oil with a fork.  Let stand for about 40 minutes.  Whisk in the mayonnaise and vinegar, and chill.  Whisk again just before serving.