They're trailing UKIP in the polls and rarely score above 10 points. They've lost a third of their members since 2010 (down from 65,038 to 42,501) and more than a thousand of their hard-won councillors. They ran a deficit of £410,951 last year and are struggling to raise the funds required to fight an adequate general election campaign. So why, ahead of the opening of their conference in Glasgow tomorrow, are the Lib Dems so cheerful?
The first reason is that the next election appears increasingly likely to result in another hung parliament. While the party could yet face a wounding left-right split  if forced to choose between the Tories and Labour (both of whom could conceivably win enough seats to form a majority government with Lib Dem support), the thought of again holding the balance of power and negotiating concessions (proportional representation for local government!) is an intoxicating one.
The second is that the party believes both that a significant number of its 2010 supporters will return to the fold before 2015 and that it is performing better than the headline figures suggest. Were the results of the latest YouGov poll  (which has them on 8 per cent) replicated on a uniform swing, the Lib Dems would retain just 17 of their 57 seats. But as the party's activists rejoice in pointing out, their vote is holding up, and even improving, in their heartlands. The Eastleigh by-election, which the party won comfortably in the most adverse circumstances (recall the misdemeanours of the two Chris's: Huhne and Rennard), is offered as ultimate proof that they are not heading for electoral apocalypse. Where the party is well organised and where it can appeal for tactical votes from Labour supporters (the Tories are in second place in 37 of the 57 Lib Dem seats), it can still win. It is this faith that explains why those calling for Nick Clegg's head are still limited to maverick non-MPs such as Lembit Opik and Lord Oakeshott.
But if they were once suffering from an excess of pessimism, many Lib Dems now appear overly optimistic. Even if their vote share rises to 15% before 2015, the laws of arithmetic mean they cannot expect to win many more than 30 seats. The party's intention to fight the next election as "57 Eastleighs" ignores the fact that this simply isn't possible. While the Lib Dems were able to pour thousands of activists and cabinet ministers into the constituency, they won't be able to do so when fighting on 56 other fronts at the same time. After decades of advancement, the party is still on course for its worst performance since 1992, losing around half of its seats. If it isn't dreading the evening of 7 May 2015, it really should be.