I don't think that asking that the Bush Administration not give up on their legitimate pre-war claims is an unfair attack or manifestation of second-guessing.
It's easy to criticise, hard to lead.
I'd just soon have Santorum carrying the water on this, at this point. BTW, see what the Philadelphia paper says about it:
"So why is the senator going on the nation's airwaves with this "explosive" but easily dismissed revelation?
It's too early to have much effect on his election battle with challenger Bob Casey Jr. By the time November rolls around, few will remember Santorum's lame attempt to defend what's become an indefensible war - except maybe a few with disgust. Perhaps when it comes to making controversial - and wrong - statements, Santorum just can't help himself."