The Post-Dispatch needs to act to force the State Police investigation forward, or the whole incident will shortly be forgotten, except for the allegations. Perhaps a daily column with updates on it. Perhaps a libel case?
"Under United States law, libel generally requires five key elements: the plaintiff must prove that the information was published, the plaintiff was directly or indirectly identified, the remarks were defamatory towards the plaintiff's reputation, the published information is false, and that the defendant is at fault."
Seems to fit all of these. I imagine there is some protection because these words are coming from a PAC but the governor has said the same stuff in news conferences.