Race remains a wild card in American politics. Candidates such as Mr. Ford, who narrowly lost the Senate race in Tennessee last year, have often come close to election only to find race flaring at the last minute to blunt their momentum. "Obama knows that just because people are saying one thing doesn't mean they will vote that way... Sen. Obama's popularity among whites also stirs uneasiness among many blacks. In the latest Wall Street Journal/NBC News poll1, Sen. Obama trails Sen. Clinton among black voters 46% to 37%. "Obama doesn't really push people to consider what diversity really is,"...