KABUL, Afghanistan (AP) _ Democratic presidential contender Barack Obama arrived in Afghanistan on Saturday, the first stop on a campaign-season tour of war zones, a spokesman said.

Less than four months before the general election, Obama's first visit to Afghanistan, with a subsequent stop in Iraq, was rich with political implications, although the Illinois senator flew as part of an official congressional delegation.

Rival John McCain has criticized Obama for his lack of time in the region, and the Republican National Committee had a running ticker tallying the more than 900 days since his last visit to Iraq.

Spokesman Robert Gibbs said Obama arrived in Kabul early Saturday.

"I look forward to seeing what the situation on the ground is," Obama told a pair of reporters who accompanied him to his departure from Andrews Air Force Base on Thursday.

"I want to, obviously, talk to the commanders and get a sense both in Afghanistan and in Baghdad of, you know, what the most, their biggest concerns are, and I want to thank our troops for the heroic work that they've been doing," he said before his flight overseas.

Obama advocates ending the U.S. combat role in Iraq by withdrawing troops at the rate of one to two combat brigades a month. But he supports increasing the military commitment to Afghanistan, where the Taliban has been resurgent and Osama bin laden is believed to be hiding.

On his trip, Obama intends to meet with Hamid Karzai, the Afghan president. He recently chided Karzai and his government, saying it had "not gotten out of the bunker" and helped to organize the country or its political and security institutions.

Also on his itinerary is a meeting with Nouri al-Maliki, the Iraqi leader. On the campaign trail, Obama has said one benefit of withdrawing U.S. troops is that it would pressure al-Maliki to shore up his government as well.

Nonetheless, he said he did not plan to reiterate those messages in person.

"I'm more interested in listening than doing a lot of talking, and I think it's very important to recognize that I'm going over there as a U.S. senator," he said. "We have one president at a time."

In a speech this week, Obama said the war in Iraq was a distraction, unlike the fighting in Afghanistan.

"This is a war that we have to win," he said. "I will send at least two additional combat brigades to Afghanistan, and use this commitment to seek greater contributions — with fewer restrictions — from NATO allies.

"I will focus on training Afghan security forces and supporting an Afghan judiciary, with more resources and incentives for American officers who perform these missions."

By contrast, his opposition to the war in Iraq — and call for an end to the U.S. combat role — helped him overcome his rivals in the battle for the Democratic presidential nomination.