Petraeus, tell us something we don't already know

General David Petraeus' testimony Tuesday and Wednesday of this week will be another chapter in U.S. foreign policy's long-running "is the surge working?" debate. The General and Ambassador Ryan Crocker will offer up some good news counterpoints to the not-so-good news out of Basra from the last weekend of March. But in the ways that matter, there's no need to debate in the present tense -- the surge isn't working, it's already worked, and the question is what the Democrats plan to do about it.