The Difference Between a Hockey Mom and a Pitbull?

Bill Kristol is on Fox with Chris Wallace and Juan Williams. Kristol tells this story:

Palin was in a meeting with McCain staffers. One young staffer said something like this:

Governor Palin, everyone is going to come at you, they’ll hit you with everything they have. Are you ready for that?

Allegedly, Palin replied:

In Alaska we have a saying: Do you know the difference between a Hockey Mom and a Pitbull?

The staffer said no. The Governor replied: