Livingstone acted as a stand-in presenter on London talk radio station LBC 97.3's Jeni Barnett for a week beginning on 30 June 2008. In July 2008 he announced his intention to run again for the office of Mayor of London at the next mayoral elections and signalled his intent to organise a "progressive alliance" of political parties (such as the Labour Party and the Green Party), trade unions and interest groups to defend the progress which was made during his terms as Mayor and to prepare for the next mayoral elections.