Don't confuse the issues; don't seem like we are unsympathetic to the dead in England; don't fall into Galloway trap of piling on or somehow being soft;
When the dust clears, there should be one unified talking point:
Bush has mismanged war on terror;
He doesn't know what he is doing; he took his eyes off Al Queda and went in unecessarily into Iraq, costing lives and treasure; and he didn't attract terrorsts into one place- Iraq; instead he lost track of them and their now all over the place.
WMD isn't even the issue anymore; the key issue to hit home with is he took his eyes of the terrorists, and now were LESS safe.
Go slow at first; but in a few days this should be pointed out strongly.