How do you use the Obama/Palin costumes?

Hey, have they released those Barrack Obama and Sara Palin skins? If they have, how do I access them?

The Barack Obama and Sarah Palin characters are a part of the "Blow It Up Again" download content. It is currently selling for 160 Microsoft Points on the Xbox 360. In the bar, you'll need to walk to the icon that looks like a coat hanger to switch characters.

Unfortunately, the characters can only be used in the four extra missions and cannot be used in the main campaign. Furthermore, these four missions are all vehicle based. At least one of these missions will not allow you to exit the vehicle, so you'll only see Barack or Sarah in the windshield. Still, it's sort of fun in a campy kind of way.