 Miliband has also been particularly critical of 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 . He has also stated that he would demand the resignation of Nick Clegg as a precursor to any future Labour @-@ Liberal Democrat coalition . In the 2011 Alternative Vote referendum , Miliband 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 , as well as current Liberal Democrat Deputy Leader Simon Hughes , the Green Party Leader Caroline Lucas and Business Secretary Vince Cable , among others . Since becoming Labour leader , Miliband has made speeches aimed at winning over disaffected Liberal Democrats , identifying a difference between the " Orange Book " 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 . 
