Haifa street near the Green Zone in Baghdad has come to symbolize the futility of America's efforts in Iraq as a whole. Right outside the safety of the Green Zone, the insurgents controlled a major street. American and Iraqi forces would clear it one day, and the insurgents would take it right back.
Here is a NY Times video from January. The fighting that night was described as "some of the most intense fighting of the nearly four-year-old war, a 10-hour-long firefight involving almost 1,000 U.S. and Iraqi troops along Haifa Street in central Baghdad, a stronghold of the Sunni insurgency."
Today, Haifa street tells a different story, one that shows what GEN Petraeus's tactics can accomplish, if given enough time and troops. Other COIN experts have been saying the same thing - we are finally executing the right plan, hopefully not too late.
Whether we can will it, given where we are as a Nation is another matter. You decide.