The post you are reporting:
Keith, there was actually a middle class, neither rich nor poor.
This middle class is gradually dissolving, some becoming rich, and many others on the down slide.
When large sectors of the average working people slide into poverty, that's when sentiments change. It's gradual, but is happening.
When people realise that the economic situation and personal chances in society won't get better, but only worse, they don't tend to give credit to the parties and their programmes.
No doubt the LibDems are aware of it, which is why they want to hold to the 50p rate, to show they are on the side of the average people who are getting poorer and don't privilege the wealthy.
But it's a feable move, rather unconvincing, and either way won't change the substance of things in terms of economic results.