Has Cameron thought this one through?

David Cameron says the Conservatives will support a referendum on Scottish independence if there's 'evidence' the public support it. Well, I suspect this is going to be a rather simpler matter than the Tory leader was bargaining for. All we need to do is draw his attention to the legion of polls showing overwhelming support for the principle of a referendum - both from those who support independence, and from those who don't. I take it you'll be backing the referendum bill then, Dave?