New York Mayor Michael Bloomberg (L), Democratic presidential candidate Senator Barack Obama (D-IL) (2nd L), Cindy McCain and Republican presidential candidate Senator John McCain (R-AZ) (R) leave after paying their respects at the site of the former twin towers in New York, on the seventh anniversary of the attack on the World Trade Center, September 11, 2008. REUTERS/Shannon Stapleton (UNITED STATES) PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)