BAGHDAD - JULY: In this handout photo released by the U.S. Army, Gen. David H. Petraeus (C), commander of the Multi-National Force in Iraq, shares a laugh with presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) (L) and Sen. Chuck Hagel (R-NE) (R) during an aerial tour July 21, 2008 in Baghdad, Iraq. Hagel and Sen. Jack Reed (D-RI) joined the presidential candidate on his tour of the Middle East and Europe.