That's not quite fair. Two of the Justices that joined the Opinion of the Court are Clinton-appointed liberals. Of the other seven judges, four dissented (Rehnquist - Nixon; O'Connor - Reagan; Scalia - Reagan; Thomas - Bush) and three joined the Opinion of the Court (Stevens - Ford; Kennedy - Reagan; Souter - Bush). The real tragedy is Kennedy -- because Bork should have written the Opinion of the Court and it then would have been 5-4 the other way. Hard to blame the Republicans for Bork's defeat -- except of course for Arlen Specter.
Well, there were four other Republicans who voted against him -- Packwood (OR), Chafee (RI), Stafford (VT), and Warner (VA).