How? He has courageously stood up to the laws of Nature and Nature's God, not to mention the Constitution of the State of Missouri, and supported the issuance by his administration of "marriage" licenses to eight persons wishing to pretend to be married by engaging in a formalized type of long-term, consensual sodomy. Not content with that, he enthusiastically hosted some pretend weddings in his office. Through Mayor Slay's groundbreaking actions, St. Louis is just the 61,367th city in the United States to engage in this kind of public policy delusion.
In a decent country, one might expect him to be thrown in jail and impeached, in no particular order.
In a properly functioning Church, one might expect him to be called to publicly recant and repent or face a decree of excommunication, ferendae sententiae.
I await the St. Louis Review's coverage of the Archdiocesan response. As for the State of Missouri upholding its own Constitution, thank goodness we have Catholic-in-good-standing Chris "All Politics, No Prosecutor" Koster as Attorney General, known for his steadfast adherence to principle.
Let the good times roll!