I don't particularly hold President Obama responsible for the weak security at a just recently opened consulate. Good lord. There are so many issues bigger than that such that no one person can have a running memory of them all. That said, he is clearly responsible for the lack of an affirmative response and for the absence of an immediate and credible investigation as to what went wrong and how this can be avoided in the future.
How lucky we all are that the same group didn't try this again within the past month because the Obama administration doesn't seem to know yet how it could have been avoided.