Miliband was also particularly critical of former Liberal Democrat Leader and Deputy Prime Minister Nick Clegg following the Conservative–Liberal Democrat coalition agreement, accusing him of "betrayal" and of "selling-out" his party's voters. In 2010, he stated that he would demand Clegg's resignation as a precursor to any future Labour-Liberal Democrat coalition under his own leadership. In the 2011 Alternative Vote referendum campaign he refused to share a platform with Clegg, stating that he had become "too toxic" a brand and that he would harm the "Yes to AV" campaign. He shared platforms during the campaign with former Liberal Democrat Leaders Lord Ashdown and Charles Kennedy, Liberal Democrat Deputy Leader Simon Hughes, the Green Party Leader Caroline Lucas and Business Secretary Vince Cable, among others. As Labour leader, Miliband made speeches aimed at winning over disaffected Liberal Democrats, identifying a difference between the "" Lib Dems, who were closer to the Conservatives, and Lib Dems on the centre-left, offering the latter a role in helping Labour's policy review at that time.