Two years and two wars after the September 11 attacks, President Bush's aura of invincibility has faded and his challenge may be to keep his presidency from being more associated with Americans dying in Iraq than with his dramatic pledge at Ground Zero to battle terrorism. Bush is shown with retired firefighter Bob Beckwith (R) at the scene of the World Trade Center disaster on September 14, 2001. REUTERS/Win McNamee-Files
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