Media Bias? Obama in Iraq

I'm wondering if the excessive coverage of Obama's Middle East trip will be helpful, or hurt him. Still, it's certain that he will get much more coverage than McCain got when he last went to Iraq. Even the International Herald-Tribune, owned by the NY Times, has a story about it. McCain wasn't the nominee yet, so this isn't really comparable. Still, if McCain goes to Iraq again before the elections, I doubt that all three network anchors will try to interview him there. They'd be more likely to label it as "using the military for political purposes," and give him minimal coverage. Why does no one say that about Obama?