Voodoo dolls actually have little to do with real voodoo practices. The idea that you can fashion a doll into the likeness of a person in order to create a magical link to them is found in a number of different traditions, but as far as I know the movie idea of sticking pins into the doll was concocted because it looked menacing on screen. Sticking a pin through a magical link to a person doesn't do anything to the person, it just damages the link. You have to cast an actual spell in order to affect a target through the use of a doll or poppet, though I suppose the pins could be specially charged so that they unleash a curse on the target when they make contact with the doll.
Legal questions aside, political voodoo dolls are a great idea - so long as they actually work. If nothing else, it would keep politicians more honest to have an army of magicians out there ready to poke them at a moment's notice. Of course, this thing probably doesn't fit the bill because I'm guessing that it's made from cheap plastic and polyester, neither of which hold enough of a magical charge to create a link, and that the pins are just ordinary pins. Nonetheless, at least the thought is present.
Somebody should try this here in the States. Or maybe they have, and I just have never heard about it. There couldn't be a legal challenge over here because in the United States public figures don't have any sort of veto power over the use of their likenesses.
Suggested reading (pdf e-books):
William Lilly - Choice Aphorisms From The Seven Segments Of CardanSepharial - Eclipses Astronomically And Astologically Considered Scanned Version
John Dee - La Grande Table De La Terre French Version Second