Race remains close in key swing statesPRINCETON, NJ -- President George W. Bush has moved back ahead of Sen. John Kerry among likely voters in the latest CNN/USA Today/Gallup poll, essentially returning the race to where it was before the three presidential debates.Among likely voters, Bush is ahead of Kerry by a 52% to 44% margin, exactly the same as in the last Gallup Poll conducted before the debates began in late September. Among registered voters, Bush has a 49% to 46% margin over Kerry.Two CNN/USA Today/Gallup polls conducted during the debates indicated that Kerry had brought the race to...