"Unfit Persons" as defined by some in our legislatures could be construed to mean "We the People". Given Republican control now, if such a thing later got in to the hands of Madam President Clinton... is there any doubt as to who would be deemed "unfit"?
Unfotunately, it could mean your children if they use the mental testing of your children in school that Bush wants. Remember, there are people considered mentally unfit that have lost the right to own/bear firearms.