After days spent in a hotel Downtown preparing for a high-stakes presidential debate, Vice President Kamala Harris and her husband, second gentleman Douglas Emhoff, traveled to an airbase next to Pittsburgh International Airport for a stroll on Sunday night. The Democratic nominee’s motorcade arrived at the airbase, which is used by the 171st Air Refueling Wing of the Pennsylvania Air National Guard, shortly before 5 p.m., according to pool reports. Ms. Harris, wearing a black hat and a scarf, and Mr. Emhoff, wearing a “Harris/Walz” sweatshirt, walked the grounds of the military base in Coraopolis. When a reporter asked...