What ought 'foundations' for political thought look like in a postmetaphysical world? I argue for a "weak" ontological model of 'foundations' and employ it in a critical reconstruction of Judith Butler's work. My specific intention is to show that this model provides a better understanding of both the strengths and weaknesses of Butler's writings than does her own notion-shared by many poststructuralists-that one does not need ontology to sustain ethical and political reflection, or, at best, only an austerely minimal one.