Are John McCain’s supporters trying to drive conservatives away from their candidate? Senator McCain is the inevitable Republican presidential nominee. He is headed, though, for a defeat of McGovernite dimensions if he can’t sway conservatives to get behind his candidacy. For their part, conservatives don’t want McCain, but even less do they want to spend the next four-to-eight years saying “President Obama,” let alone reliving history with another President Clinton. In short, there are the makings here for a modus vivendi, however grudging. Yet, McCain’s admirers appear to think belittling the senator’s good-faith opponents is the way to go. Theirs...