A Republican candidate running for a St. Louis-area House seat has published a 23-page document outlining a conspiracy theory that the footage of George Floyd, the Minneapolis man whose death in police custody has ignited weeks of protests, was staged to inflame racial tensions. “We conclude that no one in the video is really one person but rather they are all digital composites of two or more real people to form completely new digital persons using deepfake technology,” Winnie Heartstrong, who is running against Rep. Lacy Clay (D-Mo.), wrote. The document, which Heartstrong claims was written with the aid of...