It seems obvious to me that Romney is being unfairly attacked here. Here's the money quote:

Well, there's no question but that the president and Prime Minister al-Maliki have to have a series of timetables and milestones that they speak about. But those shouldn't be for public pronouncement. You don't want the enemy to understand how long they have to wait in the weeds until you're going to be gone. You want to have a series of things you want to see accomplished in terms of the strength of the Iraqi military and the Iraqi police, and the leadership of the Iraqi government.

This is not what anyone would call a timetable for withdrawal in the way McCain is implying. Then this excrescence:

In Sun City Center, Mr. McCain said he owed no apology to Mr. Romney. Instead, he said, it was Mr. Romney who should apologize "to the young men and women who are serving in uniform."

This is Clintonian. And I say that as someone who vastly prefers McCain to Romney.