Yes, a 4" x 6" rectangular white pen.
Given, the quality on the video Drudge linked to isn't very good. Try this video link, and zoom to Full Screen. You will see very clearly that it is NOT a pen.
http://www.boston.com/news/special/politics/debate_video/sept29/1.html
Yes, I see it now. Clearly paper and not pen.
if you look at the one posted at the link with the commerical, you see Kerry glance down at whatever it is he has right away, as if refreshing his mind.....