Let's assume (incorrectly) for a second that he did actually call it a terrorist attack immediately.
If that was the case and there was a terrorist attack against Americans, do you think that the best thing to do would be hop on his jet and head off to fundraisers??
The 1 positive point of his entire campaign is that Al Quaeda is "on it's heels". You wonder why he might want to do everything he could to minimize the fact that there was a terrorist attack that left Americans dead?
How is it that when something good happens, like Bin Laden being killed, he acts like he pulled the trigger himself but when it is something bad, he does everything he can to blame everybody else? It is pathetic.
If you actually think it is no big deal like your post suggests... well...
