The ninth amendment is a catch all.
"The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people."
This amendment basically says that the rights of the people are not limited to those outlined in the constitution as it is written. We have more rights than are outlined here. The rights of the people to be free shouldn't be infringed upon, and the constitution felt the need to say that this document wasn't conclusive. There really isn't much to debate in this one.
I do feel that 2nd amendment supporters should actually use the 9th amendment instead. The wording of the second is unclear as to whether or not we should be armed to have a well regulated militia or if everyone has the right to bear arms for any purpose. This one says that the the amendments are not conclusive, so they could protect the rights of the citizens to protect themselves. Just my two cents worth, though. ;)