CALIFORNIA DEMOCRATIC SEN. Kamala Harris is widely seen as a frontrunner for a spot on the ticket with presumptive nominee Joe Biden, with vetting well underway. Presidential vetting operations have entire teams of investigators, but for the public, when the pick is announced, the most common source for information about the person chosen is Wikipedia. And there, a war has broken out over how to talk about Harris’s career. At least one highly dedicated Wikipedia user has been scrubbing controversial aspects of Harris’s “tough-on-crime” record from her Wikipedia page, her decision not to prosecute Steve Mnuchin for mortgage fraud-related crimes,...