Raedwald: Cameron can't have his cake and eat it

This is all true:

Raedwald: Cameron can't have his cake and eat it:

And the fact that Cameron isn't making firm, unequivocal promises about Localism, and that when you look at the actual words he uses they turn out to be vague aspirations with no substance, means that voters don't trust him

In marketing, you have to both talk the talk and walk the walk. 
Generally you can get a punter to try your product once; but if they perceive that you have lied, they are extremey unlikely to give you a second chance.