Looks like Mercenaries 2 will let you play as either Obama or Palin to go to war with assault rifles, rocket launchers, the works! This is too funny, especially the grenade-wrestling:
http://blog.wired.com/games/2008/10/obama-palin-com.html
Partisan jab:
Spoiler:
McCain and Palin both know how to handle guns, but Obama probably hasn't even been near one.