In this photo released by the U.S. army, U.S. presidential candidate Barack Obama, left, and top U.S. military commander in Iraq, David Petraeus, talk as they take a helicopter ride over Baghdad, Iraq, Monday, July 21, 2008. Iraq's government welcomed Obama on Monday with a message of apparent common ground on American troop withdrawal goals: expressing hopes that combat forces could leave by 2010. AP Photo logo AP Photo 43 months ago

In this photo released by the U.S. army, U.S. presidential candidate Barack Obama, left, and top U.S. military commander in Iraq, David Petraeus, talk as they take a helicopter ride over Baghdad, Iraq, Monday, July 21, 2008. Iraq's government welcomed Obama on Monday with a message of apparent common ground on American troop withdrawal goals: expressing hopes that combat forces could leave by 2010.