I began this column last week with a quote attributed to Abraham Lincoln in which harsh treatment was deemed warranted for congressmen who willfully take actions during wartime that damage morale and undermine the military. It turns out to have been a paraphrase of our 16th president's attitude toward those who engage in such behavior, rather than a direct quote. I regret the error and should, instead, have used the following, verbatim excerpt from a letter President Lincoln wrote in June 1863, as Robert E. Lee's army was on the march north to the fateful battle of Gettysburg. Mr. Lincoln...