Safire's Political Dictionary
Oxford University Press.
Available in printed form only via Annie.
Described by the publisher as "a stem-to-stern updating and expansion" of the 1993 edition, adding such terms as "Axis of Evil," "Triangulation," "Compassionate Conservatism," "Islamofascism," "Earmark," "Wingnuts and Moonbats," "Slam Dunk," "Hanging Chads, and, of course, "9/11."
When and if this becomes available as an online e-book, rest assured we will acquire that, too.