Nick Clegg
As leader of the Liberal Democrats, Clegg's main policies have been to get rid of the Trident missile system, to give NHS patients the choice of private medical care, to make the length of time between elections 5 years (at the moment it only has a 5-year limit, meaning that the government can begin a new election at any time), giving more power to local government, tax cuts for the poor and for the government to do more about the environment.