European political parties have the exclusive right to campaign during the European elections (as opposed to their corresponding EP groups). There have been a number of proposals designed to attract greater public attention to the elections. One such innovation in the 2014 elections was that the pan-European political parties fielded "candidates" for president of the Commission, the so-called "Spitzenkandidaten" (German, "leading candidates" or "top candidates"). However, European Union governance is based on a mixture of intergovernmental and supranational features: the President of the European Commission is nominated by the European Council, representing the governments of the member states, and there is no obligation for them to nominate the successful "candidate". The Lisbon Treaty merely states that they should take account of the results of the elections when choosing whom to nominate. The so-called "Spitzenkandidaten" were Jean-Claude Juncker for the European People's Party, Martin Schulz for the Party of European Socialists, Guy Verhofstadt for the Alliance of Liberals and Democrats for Europe Party, Ska Keller and José Bové jointly for the European Green Party and Alexis Tsipras for the Party of the European Left.