One day after their first meeting, U.S. Senate hopefuls Barack Obama and Alan Keyes were back on the campaign trail again Monday. Speaking at a news conference at the Hotel InterContinental in Chicago, Republican Keyes added to his now familiar talking points his stance on slavery reparations. Prompted by a reporter's question, Keyes gave a brief tutorial on Roman history and said that in regard to reparations for slavery, the U.S. should do what the Romans did: "When a city had been devastated [in the Roman empire], for a certain length of time--a generation or two--they exempted the damaged city...