Here is that section from the conference where the reporter asks about Moveone.org ad and president's answer.
Q What is your reaction to the MoveOn.org ad that mocked General Petraeus as General "Betrayus," and said that he cooked the books on Iraq? And secondly, would you like to see Democrats, including presidential candidates, repudiate that ad?
THE PRESIDENT: I thought the ad was disgusting. I felt like the ad was an attack not only on General Petraeus, but on the U.S. military. And I was disappointed that not more leaders in the Democrat Party spoke out strongly against that kind of ad. And that leads me to come to this conclusion: that most Democrats are afraid of irritating a left-wing group like MoveOn.org -- or more afraid of irritating them than they are of irritating the United States military. That was a sorry deal. It's one thing to attack me; it's another thing to attack somebody like General Petraeus.