Cran-Razz recipe

I was at a friends birthday party and he had orange vodka and cranberry juice. I came up with the bright idea of 1 part vodka and 3 parts cranberry. Man was that the best idea in the world. I was handing them out left and right.

Everytime I turned around someone else wanted another. At first I didn't know the name so I called it "the big O". But I guess the name is cran-razz. But this so far is my favorite drink. I'm going to try a couple different recipes from this site. Thanks for helping me find the name of this drink.