The news from Newtown, Connecticut is unbearably sad. But bear it we must. We have no other choice. To guide us out of our despair we rely on teachers and pastors and, yes, politicians. “Whatever portion of sadness that we can share with you to ease this heavy load, we will gladly bear it,” President Obama said at an interfaith vigil on Sunday. “Newtown, you are not alone.” A speechwriter’s greatest responsibility follows a great...