A Liberal Democrats logo sits on the front of the political party's campaign bus as Nick Clegg, U.K. deputy prime minister and leader of the Liberal Democrats, tours the proposed Watford Health Campus at the development's proposed construction site in Watford, U.K., on Tuesday, March 31, 2015. Polls put the ruling Conservatives and the Labour opposition neck and neck, with neither on course to win enough votes for a parliamentary majority on May 7. Photographer: Matthew Lloyd/Bloomberg via Getty Images
