“The same thing that qualifies any of the rest of us to declare otherwise: having an opinion and a forum for it.”
The only thing that having an opinion qualifies anyone to do is to express an opinion. Declaring someone qualified or unqualified for a particular position needs some greater rationale than an opinion.
My remark was addressed to the columnist, Parker, who declared Palin unqualified. And I often declare Obama unqualified, and have a long list of reasons for saying that.