Nick Clegg was accused yesterday of using his Lib Dem conference keynote speech to justify his party’s roll in pushing through unpopular Tory policies.

The Deputy Prime Minister rattled off his party’s policies implemented by the coalition in a desperate bid to rally his party’s dwindling number of downbeat troops.

In his final appeal to the British public before the general election, Mr Clegg also pleaded for voters not to punish him for his infamous decision to sell out students and treble tuition fees.

He vowed never to make the same “mistake” again but asked voters: “How will you judge us? By the one policy we couldn’t deliver or by the countless policies we did deliver in government?”

Labour deputy leader Harriet Harman agreed that the Lib Dems should be judged on their record.

But she said: “It is a record of broken promises and weakness.

“The Lib Dems are a party which promised to scrap tuition fees and then trebled them.

“They are a party who promised fair taxes and then gave millionaires a tax cut while everyone else pays more. They’ve backed the Tories all the way.”

Mr Clegg insisted that raising the tax threshold was worth propping up the Tory-led coalition and its cuts programme that targets the poorest.

He said cutting taxes for the working poor marked his party out from Chancellor George Osborne, who preferred to hand millionnaires a tax break in his last budget.

And the Lib Dem leader promised to raise the level at which people starting paying tax by another £1,000 to £12,500 if the party has the opportunity to join a coalition after the next election.

The Child Poverty Action Group said raising personal allowance is a “poorly targeted and expensive” way of helping poor families.

Chief executive Alison Garnham said: “Many are simply paid too little to benefit from a higher tax allowance while, for those who do earn a bit more, a lot of the gain is cancelled out by benefit rules which claw back benefits as incomes rise.”