I don't often get too excited about opinion polls but this one, showing the Lib Dems up 6 points on the previous similar poll, can't be bad.
It must be significant that this comes in the month where:
Vince Cable has been again been vocal about the economy
The Lib Dems opposed Israeli action in Gaza
The Lib Dems led the campaign against the Goverment's plans to exempt MP's expenses from Freedom on Information legislation
The Lib Dems vocally opposed the Government's plans for a third runway at Heathrow.
My natural scepticism for opinion polls remains, and there is never any substitute for on the ground local campaigning, but I think that this shows that we are having a positive impact.