The Liberal Democrats' annual conference is under way in Brighton.
According to the polling organisation YouGov the party has lost four million voters since the last general election, and it says only 12% of people think Nick Clegg is honest.
Speaking to the Today programme the Liberal Democrat leader and deputy prime minister said that his "skin's got thicker" since being in government and that he has learnt much "more than at the beginning".
His comments came after he apologised for breaking his pre-election pledge not to impose a rise in tuition fees.
He told Sarah Montague that he was right to do this because the pledge was "obscuring some really important things".
On the subject of a wealth tax, Nick Clegg said "we've got to ask people who are far better off to make a fair contribution".
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