There is mounting evidence that the backlash against mainstream parties has begun. The YouGov poll for the Sun which shows UKIP on an astonishing 19% is an indication that they, rather than the BNP, are the recipient of the "plague on all your houses" vote.
Secondly I hear a lot of anecdotal reports of Tory canvassers being abused on the doorstep and that normal poltitical campaigning is almost impossible at the moment. I suspect the same is happening to canvassers from other parties.
I have predicted the complete collapse of UKIP in the European elections.It seems reports of their imminent death were rather exaggerated. Nigel Farage's boast that they could beat the Labour Party doesn't look quite so ridiculous now, does it?
The challange for the main three parties now is how to grab back the initiative. To be honest, it's difficult to see how they can do it.