Site content represents content for the entire site on a
        given election day.

def site_content(self, election_day):
        """
        Site content represents content for the entire site on a
        given election day.
        """
        from electionnight.models import PageType

        page_type = PageType.objects.get(
            model_type=ContentType.objects.get(
                app_label="election", model="electionday"
            ),
            election_day=election_day,
        )
        site_content = self.get(
            content_type=ContentType.objects.get_for_model(page_type),
            object_id=page_type.pk,
            election_day=election_day,
        )
        return {"site": self.serialize_content_blocks(site_content)}