And that would be in the area of national security. That is the only major area that McCain leads Obama in the polls. Most people believe McCain would do a better job of protecting our country than Obama, much due to the fact that the media consistently pushes that idea.
However, in this area, the Democrats should take the advice of Karl Rove and attack your opponents perceived strengths, much like the Repubs attacked John Kerry's war record in 2004. We should learn from our mistakes.
Wesley Clark has been out in front in making the point that John McCain does not have the experience to be Commander in Chief. Simply being a former POW does not add up to "experience". It is about judgement and communication skills. John McCain is severely lacking in both areas. He was one of the biggest cheerleaders for the war in the first place but now wants credit for being one of the first to support the "surge", which has not yet worked - although violence has subsided.
And the reason violence has subsided is because Bush & Co decided to not only talk with the enemy but to negotiate with them also. That is what they did with the Sunnis in the Anbar Province. They talked with the enemy. At the same time, John McCain accuses Barack Obama of wanting to "negotiate with our enemies"? John McCain would like to have his cake and eat it too...