According to Card (and I tend to agree), only Giuliani and McCain acted responsibly, saying the right things. Romney pretty much said nothing. The others (Clinton, Obama, Huckabee, Biden and Edwards) all said things that, if said by a President or an ambassador, would destroy our peaceful relationship with Pakistan, possibly even expanding our current war to one where we have to fight more than just terrorists.
You may disagree with Giuliani and McCain. You may even agree with what the others said, but in the final analysis, these two people are the only ones who seem to understand diplomacy and foreign relations enough to not turn Pakistani tragedy into a US atrocity.