Chicago mayor Lori Lightfoot (D.) on Friday expressed dismay that people are "still" meeting in private spaces but defended her choice to appear without a mask at a giant gathering of Joe Biden supporters. Lightfoot justified the flouting of social distancing guidelines by telling MSNBC's Stephanie Ruhle that "everyone was wearing masks"—a claim disproved by Lightfoot's own video—and saying Saturday's celebration came at a time "when we actually do need to have relief and come together." The mayor tweeted a video of her partying with other Biden supporters and telling them, "You should absolutely celebrate this victory and savor every...