"Vodka's traditionally potato likker"
An urban legend. Vodka is typically made from grain. You can find some Eastern European countries that use potato, you can also find some vodkas made from grapes.
The notion that vodka is made from (only) potatoes is wrong.
I was under the impression that White Lightning can be distilled from virtually anything, that its what you do with the stuff after you distill it that turns it into vodka, gin, whiskey, rye, etc.
Am I right (more or less)?