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A lorry displaying a Conservative party poster which pictures Labour Party Leader Ed Miliband in the pocket of former Scottish First Minister Alex Salmond parked outside the Labour Party's Spring event in Birmingham, central England on March 14, 2015. Ed Miliband, who hopes to become prime minister on May 7, urged voters to choose hope over fear at a rally for activists Saturday. Miliband is fighting Prime Minister David Cameron for the keys to Downing Street in a knife-edge race which commentators predict could result in another coalition or a minority government for Britain. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

A lorry displaying a Conservative party poster which pictures Labour Party Leader Ed Miliband in the pocket of former Scottish First Minister Alex Salmond parked outside the Labour Party's Spring event in Birmingham, central England on March 14, 2015. Ed Miliband, who hopes to become prime minister on May 7, urged voters to choose hope over fear at a rally for activists Saturday. Miliband is fighting Prime Minister David Cameron for the keys to Downing Street in a knife-edge race which commentators predict could result in another coalition or a minority government for Britain. AFP PHOTO / JUSTIN TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)