Election 2015: Nick Clegg pledges 'heart' in Lib Dem policies
Nick Clegg has said it is vital the Liberal Democrats are part of the next government to stop it "lurching off to the extremes".
Launching his manifesto launch, the Lib Dem leader said a vote for his party would stop the Tories or Labour governing on their own.
He said key priorities for Lib Dems were education, health, tax and the environment.