With all the rancor in politics these days, the CNN/New York Times Democratic debate on Tuesday night delivered a rare moment of comity: Twelve Democrats agreed, apparently without compensation, to appear in a Donald Trump ad. Other points on which the Democrats came together in peace and harmony: -- Trump should be impeached. -- Abortion is great. -- Obamacare sucks. At least we’re all finally agreed on Obamacare! Obamacare has given us a system -- to quote Sen. Bernie Sanders of Vermont -- “which is dysfunctional, which is cruel, 87 million uninsured, 30,000 people dying every single year, 500,000 people...