Speaking to a crowd in Erie, Pa., on the last Saturday in September, former president Donald Trump lambasted his Democratic opponent. “Crooked Joe Biden became mentally impaired — sad — but Lyin’ Kamala Harris, honestly, I believe she was born that way,” he said, mispronouncing the Democratic presidential nominee’s name as the crowd chuckled. “There’s something wrong with Kamala, and I just don’t know what it is, but there is definitely something missing.” Ten minutes later, he offered an even blunter assessment, warning that the nation’s immigration system was being mismanaged by “stupid people like Kamala.” “She’s a stupid person,”...