Students playing the roles of US Republican presidential nominee Senator John McCain (R-AZ) (R), Democratic presidential nominee Senator Barack Obama (D-IL) (L), and another in the role of the moderator (C) rehearse at Belmont University in Nashville, Tennessee October 6, 2008. The second debate between the two candidates takes place October 7th. REUTERS/Rick Wilking (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)