As for usings corporal punishment I believe it is a personal choice that should be the right of parents to make. The second the government tells me how to raise my child is the second the government can pay for it. Becoming a parent is a responsibility that is being taken far too lightly these days. I was spanked as a kid, not excessivly, but enough to set me straight when I really screwed up. I seemed to have turned out just fine.
Ultimately, I think that is what I would say also. It is a parental choice, unless the line is crossed and a child is being abused.