I don't like Obama.
I don't like Holder.
But, the situation is twisted. The question was if there was ever an instance where we would use drones on our soil. The question, and Holder's response was purely hypothetical and used 911 as an instance of defending against terrorism.
To me, since it's purely hypothetical and we can't define all of the scenarios, and it was related to terrorism, I suppose there could be an instance where we would need to defend our country, within our country.