From abortion bans to Obamacare cuts to, maybe, an empty Supreme Court chair, the Republicans already know exactly what they’ll do if they get control of both houses of Congress. Passing a federal law banning almost all abortions after 20 weeks. Defunding parts of Obamacare. Weakening the Environmental Protection Agency. Kneecapping the Consumer Financial Protection Bureau, Elizabeth Warren’s baby, the new agency within the Fed to police consumer fraud. And—maybe, just maybe—letting a Supreme Court seat sit vacant until after the next presidential election. That’s just the start of what happens if the Republicans win back the Senate this November....