Judicial Ethic Rules?

Posted on the 29 July 2014 by Mikeb302000
It seems that Judge Scullin, the judge who invalidated DC's carry ban, reported reimbursement for attending a seminar in Florida sponsored by the Charles Koch funded George Mason University Law and Economics Center, aka Mercatus Center in 2010. But I'm sure that didn't have anything to do with his ultimate ruling. It was just a coincidence. Right?
www.judicialwatch.org/wp-content/uploads/2013/11/Frederick-J-Scullin-Jr-Financial-Disclosure-Report-for-2010.pdf
I think the same  is true for Silberman (Parker), and Thomas and Scalia: they have all accepted gifts from the Kochs or Koch funded entities.
Where are the judicial ethic rules for Federal Judges? Who enforces them if they exist?