Mock Marzetti's Slaw Dressing

I can't seem to buy this product in Marin County so I found this on the internet.

Blend together:
2 c mayo
2/3 c sugar
1/4 c white vinegar
2 TBS yellow mustard

I always use it in my mother's potato salad recipe. Boiled peeled new potatoes, hard-boiled eggs, diced celery and red onion, salt, pepper, Tabasco sauce and healthy dose of Marzetti's slaw dressing. Yum!