Outlining the party's plans to tackle poverty, he said the benefits system needed to be 'simplified' with the number of benefits cut from 50 to 25.
Mr Campbell said the Lib Dems would have, 'as a first step, an immediate link' between pensions and earnings to be partly financed by 'less extravagant public sector pension commitments.'
Greater priority must be given to investment in affordable housing.
'The failure to deliver on affordable housing has been a major failure of Labour's 10 years in power.'
Mr Campbell's full speech
The party yesterday announced changes to its shadow cabinet. Former local government spokesman Ed Davey becomes Mr Campbell's chief of staff.
Policy & politics