Sarah Palin introduced the pit bull theme with a joke written for her, a joke which is a modification of one that is slightly more sexist, to wit, "What is the difference between a pit bull and a woman with PMS?" Basic sleazy club comic stuff.
Just as Barack Obama has seized on the bridge theme by saying, "Then I've got a bridge in Alaska to sell you," the pit bull theme is begging for expansion.
Why don't we explore the many differences between hockey moms and pit bulls? Maybe we can get a joke onto TDS. Jon, if you're reading this, it's public domain.
Here's a start.
A pit bull only needs to go to three or four colleges to get a degree.
A pit bull can't see Russia from here.
A pit bull answers subpoenas, because she isn't afraid of confrontation.
A pit bull knows that Fannie Mae isn't owned by the government.
A pit bull wants to go on Olbermann's show.
You get the idea. Anyone else?