I've seen a couple of others on FR say the same thing. One poster, can't remember now who, has said that he thinks AQ wants to use our own Constitution to do us in, and the poster believes the way to do that is through stopping the election. He wouldn't go into detail, but from reading the Constitution myself a bit now, I can see how it would be possible, if people in certain positions of power are removed, not just the one at the top either. At the very least, it would cause months of confusion.
I started thinking about this last month when it was reported in Newsweek and elsewhere that DHS requested that the DOJ Office of Legal Counsel look into whether and how the election could be postponed in the event of a terrorist attack. It seemed fishy to me that an attack on the order of 9-11 would require a delay in the election and started me thinking that specific people, not buildings, were the next target.