I don't understand the original question. How can one seriously support either candidate without being partisan?

I understand "partisan" to mean "supporting one party over another" and "non-partisan" to mean "having no preference among political parties."

I suppose you could say you were non-partisan if your reason for liking a certain candidate had nothing to do with what what party he belonged to. Say, for example, you liked him solely because he is a military hero or because he can speak Spanish.

I'm afraid ALL my reasons for supporting Kerry are partisan ones.