Federal judges have to abide by an ethics-based Code of Conduct. Well, most of 'em, anyway. The Supreme Court, being, well, supreme, sets its own rules.
In his 2011 end-of-year report, Chief Justice John Roberts addressed the rising tide of Supreme Court ethics questions by arguing that the Code of Conduct, which is mandatory for all other federal judges, should not be mandatory for Supreme Court justices, as it does not "adequately answer some of the ethical considerations unique to the Supreme Court."
Prepare to fill in the gaps then Mr. Chief Justice, as Congress is aiming to force the Supreme Court to adopt its own ethical standards, based, in part, on that Code of Conduct, reports Politico.