I voted No too.....and really, if you think about it, how will banning help? Sure it might stop the idiots that own them, but it will also stop the good people from owning them too. But it won't stop the dogfighters. People who fight their dogs are already doing it illegally, so what makes you think they won't own a Pittie illegally too? So basically, it would just stop the good people from owning them.
That would be like banning guns. (Kinda.) It would only stop the responsible ones that obey the law from owning one. But then, all of the people who would use them for illegal purposes anyway, would just own them illegally.