One thing it might be would refer to a previous catch I had some months back, when Kerry spoke before the racial correspondents' convention, he stated that he had met with the UN Security Council the week before the Senate vote on the Iraq war (when he'd actually spent that time campaigning in Iowa, as I recall). I noted he made the same (erroneous) claim during the presidential debates.
Here's the transcript. I didn't catch a reference to the UN Security Council. Did I miss it?