Here’s the left’s next great idea for bringing down President Trump: another women’s march. Which means another public instance of Trump haters shouting slogans to one another and mistaking it for constructive politics. What progressives need to defeat Trump is outreach, but all they have is outrage. On March 8, organizers seem to be aiming for a different vibe than the librarians-in-pussy-hats element that made the first women’s march after Trump’s inauguration so adorable. Instead of milling around Washington, organizers have in mind a “general strike” called the Day without a Woman. In a manifesto published in The Guardian on...