Another real issue here is the fact that "Pitbull" is not really a breed, although it's most commonly used to refer to the American Pit Bull Terrier, the American Staffordshire Terrier, Staffordshire Terrier, and even the Bull Terrier get lumped in. My American Bulldog is a little on the small side at 110Lbs and often gets mistaken as a pitbull. With all the backyard breeding going on, who is going to make the call as to what is and what is NOT a pitbull? Once all the pitbulls are banned, which dog is next in line? Rotti's? Chihuahua's?
I grew up with a pitbull in the house, had another when I was 20, and have an American Bulldog now. I cant always tell what is and whats not a pit.
Try for yourself:
Pet PitBull - Legislation
BTW there was a video of a reporter for this site with a print out of this page asking a politician who is avidly against pitbulls to find the pitbull and he screwed it up.