The Politico and the Washington Post are using the word "ad-lib" to describe Sarah Palin's joke last night about the difference between a hockey mom and a pit bull (answer: lipstick).
But if you believe the dictionary definition of the term, Palin's unscripted one-liner was hardly improvised. A McCain aide recalls Palin making the same joke earlier this week. One pro-Palin blogger remembers her including the joke in a newspaper op-ed column before she ran for governor.