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