Each justice hires their own clerks, and applications are made individually to the justices. It isn't a group decision.
Sandra Day O'ConnorThe purpose prong of the Lemon test requires that a government activity have a secular purpose. That requirement is not satisfied, however, by the mere existence of some secular purpose, however dominated by religious purposes... The proper inquiry under the purpose prong of Lemon, I submit, is whether the government intends to convey a message of endorsement or disapproval of religion.
Sandra Day O'Connor