The Supreme Court has original jurisdiction when a State is a party, but Congress has given the States an option of filing in a District Court. So the State of Washington could have filed this case in the Supreme Court, but chose to file in a District Court. This was likely done because the District Court and the Ninth Circuit would be easy wins, while the Supreme Court could go either way.
unfortunately the word SHALL means it is MANDATORY and NOT an option, even if CONgress said they could, unless they amend the Constitution, the Judges of these Inferior Courts should be PROSECUTED!