"CDC Director Rochelle Walensky is having a rough week. After her own agency confessed that prior infection provided superior protection to the Delta variant than vaccination alone, she is now regretfully informing the American people that “fully vaccinated” was all a lie. She didn’t explicitly call it a “lie,” but she might as well have. Walensky appeared on CBS News to deliver the bad news to the remaining Covid expert believers. “What we really are working to do is pivot the language to make sure that everybody is as up-to-date with their Covid-19 vaccines as they personally could be, should...