For about three years, I've had somewhat of a love affair with a man who has been dead nearly 140 years. And yes, my husband knows all about it. In fact, he has encouraged this relationship from the start. Robert Jefferson and I met when I first became involved with Historic Eleutherian College Inc., a nonprofit in Madison, Indiana, whose purpose is the preservation of a three-story stone building on a hill in nearby Lancaster. Built in the mid-1850s, the building consisted