You know what is "hack", don't you?
I guess he/she has hacked some super-computers and manipulated some of the informations there. What is humourous is that he had "made it illegal for fat people to vote in Alabama. But bald people can vote twice".
It is funny that fat people are not allowed to vote and bald people can vote twice, specially if the hacker is thin and bald himself. That's what I guess from your quotation.