If I were AQ, I wouldn't concentrate all my energy and effort into fighting the US in Iraq. I'd try to carry out a rash of localized domestic attacks in the US so that the anti-war movement could claim that our presense in Iraq is backfiring and inciting domestic terrorism. You and I both know that normal people would only be enraged by such attacks and would support the war being escalated. But I think it's a safe bet that liberals would vent their rage at Bush instead of the terrorists, and demand that we withdraw.
So if I were AQ, I'd deploy my best operatives in Iraq to continue harrassing the coalition there, and at the same time, I'd employ domestic recruits in the US to carry out enough small attacks to increase liberal whining and erode support for the war. AQ knows they have many friends here -- in Congress, in the MSM, in academia, in Hollywood -- that would exploit such attacks in accordance with their agenda.
And that's why, in the final analysis, I believe the MSM hasn't covered the OU bombing for the simple fact that it didn't succeed. Had Hinrichs succeeded in pulling off what he planned, and killed a lot of people in the stadium, the MSM would have been all over the story. Not because such an event couldn't be ignored, but because they would use it to bash Bush and the war.