 Now, in more ordinary English, there is a way of hearing something along the lines of (7) as true: assuming that we are talking about the Prime Minister who  actually called for a referendum, of course he might not have. But that is not how definite descriptions are typically assumed to function; rather, they are typically understood to be flexible, or  non-rigid across the space of possibility, picking out whatever happens to satisfy them in whatever possible situation we are considering. So, if the descriptivist is to avail herself of this sort of defensive maneuver, as some have been tempted to, then she will have to motivate the claim that names are semantically equivalent not to definite descriptions per se, but rather to ‘actualized’ or ‘rigidified’ versions  thereof.[3]