Specifically, they campaigned at the General Election to oppose any increase in tuition fees.
Then they voted for the increase shorty after joining the Government.
Politicians are economical with the truth, but such blatant hypocrisy is unpresedented.
// Both these also true of the Tories, and yet the Tories popularity has not nosedived in the same way. //
The Tory vote has not collapsed because we are getting Tory policies. The people who voted LibDem (a lot of disaffected Labour supporters) have seen very little of what they voted for enacted. In short, the LibDems haven't deluvered.