Here's an interesting one for Gordon Brown. Through the autumn he was letting it be understood he favoured the introduction of a Tobin Tax - though he has been studiously non-specific, falling back on an arm-waving conflation between this and various other (more respectable) levies on banks that have been mooted, such as bailout insurance, or contingent capital adequacy. Indeed he has been at it this very afternoon in answer to the final question of PMQs.
His reasoning on this isn't hard to fathom. All manner of misty-eyed, woolly-thinking saps reckon Tobin sounds like a great idea, and Brown would very much like their votes. On the other hand, it is opposed by, well, everyone else really. So when Brown is amongst grown-ups and this is drawn to his attention, he can sidestep by saying the exact details of a bank levy have yet to be agreed internationally.
Now the luvvies have swung into action on YouTube, led by the bard of soft-brained feel-good comedy, Richard Curtis and his main man Bill Nighy. (Cue jokes about Vicar of Drivelly, Gordon Brown - Edge of Reason, Mr Has-Bean ... fill in your own favourite Curtis scripts here.) They want a lovely fluffy Tobin Tax ! Billions and billions for all their favourite causes, painlessly prised from those nasty bankers.
Gordon, whatever are you going to say ? There will be so much disappointment when you level with the luvvies ...