On a recent pilgrimage to Gettysburg I ventured into the Evergreen cemetery, the scene of chaotic and bloody fighting throughout the engagement. Like Abraham Lincoln on a cold November day in 1863, I pondered the meaning of it all. With the post-Tea Party wave of libertarianism sweeping the nation, LincolnÂ’s reputation has received a serious pillorying. He has even been labeled a tyrant, who used the issue of slavery as a mendacious faux excuse to pummel the South into submitting to the will of the growing federal power in Washington D.C. In fact, some insist, the labeling of slavery as...