I'd say about $200 right now, $500 if McCain gets elected. Do you own it?
It looks like the domain's about 8 years old and was originally registered by Palin's campaign back when she was running for Mayor of Alaska. Her campaign might even be willing to buy the domain off you.
I don't see any precedents on NameBio for domain sales involving U.S. vice presidents, although Estibot does appraise DickCheney.net at $4300.
Good luck with it.