In addition, Obama also promised long-term support to Afghanistan when he met with Afghan President Hamid Karzai in the Presidential Palace on Sunday.

US Democratic presidential candidate Barack Obama (R) and Afghan President Hamid Karzai walk at the presidential palace in Kabul July 20, 2008.

Matters pertaining situation in Afghanistan, regional stability, fight against drug, war on terror and enhancing Kabul-Washington relations were discussed.

Both sides had exchanged views on boosting economic relations between Afghanistan and the United States and on bolstering reconstruction process of the post-Taliban nation in the meeting.

Obama has embarked on a multi-stop overseas trip for meetings with a number of heads of states since last week.

The trip is aimed to bolster the US presidential hopeful's credentials in foreign policy and national security, which is considered his "weak point" in comparison to his Republican rival John McCain.

In a recent Washington Post/ABC News poll, 48 percent of registered voters said Obama would make a good commander in chief, compared with 72 percent for McCain.

(Xinhua News Agency July 27, 2008)