Ten days ago, Congressmember Eric Swalwell was getting very close to becoming the Democratic candidate for governor of California. But then he imploded amidst sensational accusations of sexual harassment and assault. Within hours of the revelations, Swalwell abandoned his campaign and then resigned from Congress and is now under criminal investigation. Why Swalwell was leading the field of Democratic hopefuls was never clear. His only claim to political fame was being one of President Donald Trump’s most persistent critics — which, of course, has little to do with governing the nation’s most populous state. It seemed he was seen as...