Obama visits U.S. troops in Afghan capital

U.S Democratic presidential candidate Barack Obama (C) greets a U.S. soldier during a visit to Camp Eggers in Kabul in this July 20, 2008 handout picture by the U.S. Combined Security Transition Command Afghanistan. Obama had breakfast with U.S. troops in the Afghan capital on Sunday and talked about their experiences in the country that has seen a sharp rise in violence this year. (Xinhua/Reuters Photo)

U.S. Democratic presidential candidate Barack Obama (L) speaks during a visit to Camp Eggers in Kabul in this July 20, 2008 handout picture by the U.S. Combined Security Transition Command Afghanistan. (Xinhua/Reuters Photo)

U.S. Democratic presidential contender Barack Obama poses for photo with an Afghan man during a meeting with Gul Agha Shirzai, the governor of Nangarhar province in the city of Jalalabad east of Kabul July 19, 2008. (Xinhua/Reuters Photo)

U.S. Democratic presidential candidate Sen. Barack Obama (D-IL) meets with troops in Kuwait, in this frame grab taken on July 18, 2008 and released on July 19. (Xinhua/Reuters Photo)